SCHEDULE 14A INFORMATION

                   CONSENT STATEMENT PURSUANT TO SECTION 14(A)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
Filed by the Registrant  [ ]
Filed by a Party other than the Registrant [X]

Check the appropriate box:

[X] Preliminary Consent Statement
[ ] Confidential, for Use of the Commission only (as permitted by rule
    14a-6(e)(2))
[ ] Definitive Consent Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec. 240.14a-11(c) or Rule 14a-12

                     ATLANTIC COAST AIRLINES HOLDINGS, INC.
--------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)

                              MESA AIR GROUP, INC.
--------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X] No fee required.

[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

    (1) Title of each class of securities to which transaction applies:
        ________________________________________________________________________

    (2) Aggregate number of securities to which transaction applies:
        ________________________________________________________________________

    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
        filing fee is calculated and state how it was determined):
        ________________________________________________________________________

    (4) Proposed maximum aggregate value of transaction:
        ________________________________________________________________________

    (5) Total fee paid:
        ________________________________________________________________________

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

    (1) Amount Previously Paid:
        ________________________________________________________________________

    (2) Form, Schedule or Registration Statement No.:
        ________________________________________________________________________

    (3) Filing Party:
        ________________________________________________________________________

    (4) Date Filed:
        ________________________________________________________________________


PRELIMINARY COPY; SUBJECT TO COMPLETION
November 20, 2003

                              --------------------

                                CONSENT STATEMENT
                                       OF
                              MESA AIR GROUP, INC.

                              --------------------

To the Stockholders of Atlantic Coast Airlines Holdings, Inc.:

This Consent Statement and the enclosed WHITE consent card are from Mesa Air
Group, Inc. ("Mesa," "we" or "us"), for the solicitation by Mesa of written
consents from you, the holders of shares of common stock of Atlantic Coast
Airlines Holdings, Inc. ("Atlantic Coast"), to take the following actions
without a stockholders' meeting, as authorized by Delaware law:

            (1) Remove each member of Atlantic Coast's board and any person
      (other than those elected by this consent) elected or appointed to the
      Atlantic Coast board pursuant to a vacancy caused by the removal or
      resignation of any of the directors from the Atlantic Coast board or any
      newly-created directorships;

            (2) Elect the nominees described in this Consent Statement to serve
      as directors of Atlantic Coast (or, if any such nominee is unable to serve
      as a director of Atlantic Coast, any other person designated as a nominee
      by the remaining nominee or nominees); and

            (3) Repeal each provision of the Atlantic Coast by-laws or
      amendments, if any, adopted after August 14, 1998 (the last date the
      by-laws were filed with the Securities and Exchange Commission ("SEC"))
      and before the effectiveness of these three proposals.

      This Consent Statement and the enclosed WHITE consent card are first being
furnished to Atlantic Coast's stockholders on or about [ ], 2003.

                       Mesa Exchange Offer/Merger Proposal

      On October 6, 2003, Mesa advised the Atlantic Coast board of our intention
to enter into a business combination with Atlantic Coast (the "Mesa proposal").
This business combination would have taken the form of either an exchange offer
(the "Mesa exchange offer") or a merger agreement (the "Mesa merger proposal"),
in each case pursuant to which each Atlantic Coast share of common stock would
be exchanged for 0.90 of a share of Mesa common stock (collectively, the "Mesa
exchange offer/merger proposal") in a transaction expected to be tax-free to
Atlantic Coast stockholders. Based on the closing prices of shares of Mesa and
Atlantic Coast common stock on October 3, 2003, the last trading day before our
announcement of our intention to enter into a business combination with Atlantic
Coast, the exchange ratio represented a 25% premium over the price of shares of
Atlantic Coast's common stock. The exchange ratio also represented a premium of
35.7% over the average closing price of Atlantic Coast stock between July 28,
2003, the day Atlantic Coast announced its intention to transform itself into a
low-fare independent airline, and October 3, 2003.

      Your board rejected the Mesa proposal. Atlantic Coast has also taken a
number of steps that Mesa believes are designed to hinder our efforts to proceed
with this consent solicitation and our ability to proceed with the Mesa exchange
offer/merger proposal, including inappropriately setting a record date for this
consent solicitation and filing a lawsuit to enjoin Mesa from making the Mesa
exchange offer. See "Background of this Consent Solicitation" beginning on page
[ ].

      Furthermore, on November 18, 2003, Atlantic Coast announced that it had
entered into a binding memorandum of understanding with Airbus for a firm order
of ten new A319 aircraft; five new A320 aircraft; and leasing commitments from
operating lessors for ten additional A319 aircraft, as part of their plan to
operate as a low-fare independent airline (the "Airbus MOU"). On November 19,
2003, Mesa announced that, notwithstanding this action by Atlantic Coast, we are
moving forward expeditiously with our consent solicitation to replace Atlantic
Coast's board. We also intend to proceed with the Mesa exchange offer/merger
proposal, subject to considering the impact of these developments on the value
of Atlantic Coast and consequently, on our offer.



      MESA BELIEVES THAT CONSENTING TO EACH OF THE PROPOSALS WILL GIVE THE
STOCKHOLDERS OF ATLANTIC COAST THE OPPORTUNITY TO HAVE THEIR COMPANY CONTROLLED
BY A BOARD WHO WILL ACT IN THE STOCKHOLDERS' BEST INTEREST AND WHO WILL CONSIDER
THE MESA PROPOSAL.

      MESA RECOMMENDS THAT YOU CONSENT TO EACH OF THE PROPOSALS

      Approval of each of the proposals ("proposals") requires the affirmative
consent of a majority of the outstanding shares of Atlantic Coast common stock.
Both proposals 1 and 2 must be approved for either of them to be effective.
Proposals 1 and 2 may be adopted and become effective independent of proposal 3,
and proposal 3 may be adopted and become effective independent of proposals 1
and 2. The purpose of the proposals is to elect the nominees to the Atlantic
Coast board. The nominees, if elected to the Atlantic Coast board, are expected
to act in the best interest of Atlantic Coast stockholders. The nominees are
independent persons who are not affiliated with Mesa and who believe that, to
the extent taking such action is consistent with their fiduciary duties: (i)
Atlantic Coast should be returned to its historic business strategy of operating
pursuant to revenue guarantee code share agreements with major airlines serving
hub networks; (ii) Atlantic Coast should consider, and if appropriate, negotiate
a business combination transaction with Mesa or any other party; and (iii) if
appropriate, any impediments to the ability of Atlantic Coast stockholders to
consider any business combination transaction with Mesa or any other party
should be removed.

                 WHY DO YOU NEED TO CONSENT TO THESE PROPOSALS?

      Mesa believes that the current Atlantic Coast business strategy to operate
as an independent low-fare airline not only hurts the value of the company, but
also precludes its stockholders from considering alternative business
strategies. The current directors have recently determined to abandon Atlantic
Coast's profitable strategy of operating as a regional airline pursuant to
revenue guarantee code share agreements with major airlines serving hub
networks. According to airline industry analysts, Atlantic Coast's strategy has
never been successfully implemented by a domestic air carrier operating
primarily with regional jets. The value of Atlantic Coast common stock dropped
33% between July 25, 2003, the last trading day prior to Atlantic Coast's
announcement of its intention to become an independent low-fare airline, and
July 29, 2003, the day after such announcement. You are urged to obtain current
market quotations for Mesa and Atlantic Coast common stock.

      If elected to the Atlantic Coast board, we believe that the nominees will,
to the extent taking such action is consistent with their fiduciary duties:

      1.    Return Atlantic Coast to its historic business strategy of operating
            pursuant to revenue guarantee code share agreements with major
            airlines serving hub networks. In that regard, they intend to:

            o     review the Airbus MOU to determine if it can be rescinded or
                  terminated and the consequences thereof;

            o     consider an agreement with United Airlines on terms
                  substantially comparable with the non-binding memorandum of
                  understanding Mesa entered into with United Air Lines, Inc.
                  ("United Airlines") on November 12, 2003 (the "United MOU")
                  and described under "Mesa Strategic Plans" beginning on page
                  [ ]; and

            o     attempt to solidify a code share relationship with Delta Air
                  Lines, Inc. ("Delta Air Lines") on commercially reasonable
                  terms satisfactory to all parties.

      2.    Consider and, if appropriate, negotiate a business combination
            transaction with Mesa or any other party. In that regard, they
            intend to:

            o     attempt to minimize any damages arising from the entering into
                  and/or termination of the Airbus MOU;

            o     allow Mesa to proceed with the Mesa exchange offer/merger
                  proposal (which we have indicated we are still committed to
                  making); and


                                      -2-


            o     if Mesa has not already commenced the Mesa exchange offer,
                  promptly enter into discussions with Mesa with respect to a
                  business combination transaction.

      3.    Remove impediments to the consideration by Atlantic Coast
            stockholders of any appropriate business combination transaction,
            including either an exchange offer or a merger with Mesa or any
            other party, if appropriate, by:

            o     considering, to the extent that it is in the best interest of
                  the Atlantic Coast stockholders, taking action to remove the
                  impediments to the consummation of an exchange offer or a
                  merger proposal from Mesa and any alternative proposals
                  arising pursuant to that certain Rights Agreement, dated as of
                  January 27, 1999, between Atlantic Coast and Continental Stock
                  Transfer & Trust Company, referred to herein as the "poison
                  pill"; and

            o     considering taking action to exempt an exchange offer or a
                  merger proposal from Mesa, or any other alternative
                  transaction that they believe to be in your best interest,
                  from the restrictions of Section 203 of the Delaware General
                  Corporation Law (the "Delaware anti-takeover law").

         ACT NOW TO PROTECT YOUR INVESTMENT AND YOUR RIGHT TO DECIDE THE
                  BUSINESS STRATEGY EMPLOYED BY ATLANTIC COAST

      As of October 10, 2003, Mesa was the beneficial owner of 1,603,529 shares
of Atlantic Coast common stock, representing approximately 3.5% of the
outstanding shares. According to Atlantic Coast's Quarterly Report on Form 10-Q
for the quarter ended September 30, 2003, as of November 1, 2003, there were
45,333,310 shares of Atlantic Coast common stock outstanding. The record date
for determining the stockholders of Atlantic Coast who are entitled to consent
is [ ], 2003.

      YOUR CONSENT IS IMPORTANT! TO CONSENT TO OUR PROPOSALS PLEASE DO THE
FOLLOWING:

      o     PROMPTLY SIGN AND RETURN THE ENCLOSED WHITE CONSENT CARD

      o     DO NOT RETURN ANY CARD SENT TO YOU BY ATLANTIC COAST MANAGEMENT

      If your shares of Atlantic Coast common stock are held in your own name,
please sign, DATE and mail the enclosed WHITE consent card today in the
postage-paid envelope provided or mail the completed card to MacKenzie Partners,
Inc. ("MacKenzie") at the address below.

      If your shares of Atlantic Coast common stock are held in "Street-Name,"
only your bank or broker can execute a consent on your behalf, but only upon
receipt of your specific instructions. To ensure that your consent is effective,
please contact the persons responsible for your account and instruct them to
execute the WHITE consent card on your behalf. Mesa urges you to confirm in
writing your instructions to the person responsible for your account and provide
a copy of those instructions to Mesa in care of MacKenzie at the address set
forth below so that Mesa will be aware of all instructions given and can attempt
to ensure that such instructions are followed.

       IF YOU HAVE ANY QUESTIONS OR REQUIRE ANY ASSISTANCE IN EXECUTING OR
               DELIVERING YOUR CONSENT, PLEASE WRITE TO OR CALL:

                            MacKenzie Partners, Inc.
                               105 Madison Avenue
                            New York, New York 10016
                                 (212) 929-5500
                         Call Toll-Free: (800) 322-2885

      IF YOU DO NOTHING, THE EFFECT WILL BE A VOTE AGAINST THE PROPOSALS. THE
AFFIRMATIVE VOTE OF A MAJORITY OF ALL OUTSTANDING SHARES IS NEEDED IN ORDER TO
REMOVE AND REPLACE THE CURRENT DIRECTORS OF ATLANTIC COAST.


                                      -3-


              QUESTIONS AND ANSWERS ABOUT THIS CONSENT SOLICITATION

Q:    WHO IS MAKING THE SOLICITATION?

A:    Mesa.  Mesa is a holding company whose  principal  subsidiaries  operate
      as regional air carriers providing scheduled passenger and airfreight
      service. Mesa currently operates 150 aircraft with 938 daily system
      departures to 163 cities in 40 states, the District of Columbia, Canada,
      Mexico and the Bahamas. Mesa operates in the West and Midwest as America
      West Express; in the Midwest and East as US Airways Express; in Denver and
      the West as United Express; in Denver as Frontier JetExpress until
      December 31, 2003; in Kansas City with Midwest Express and in New Mexico
      and Texas as Mesa Airlines. As of October 10, 2003, Mesa was the
      beneficial owner of 1,603,529 shares of Atlantic Coast common stock,
      representing approximately 3.5% of the outstanding shares.

Q:    WHAT ARE WE ASKING YOU TO CONSENT TO?

A:    You are being asked to consent to three proposals in order to replace
      Atlantic Coast's current directors with independent persons who are not
      affiliated with Mesa and who have indicated they will act in your best
      interest.

Q:    WHY ARE WE SOLICITING YOUR CONSENT?

A:    We are soliciting your consent because we believe that the current members
      of the Atlantic Coast board have embarked on a misguided strategy that has
      contributed to a steep decline in the value of Atlantic Coast's common
      stock and therefore have failed to act in your best interest. Mesa
      believes this is the case based on the following:

      o     Atlantic Coast has announced its intention to transform itself from
            a regional airline operating pursuant to revenue guarantee code
            share relationships with major airlines serving hub networks to an
            independent low-fare airline. According to airline industry
            analysts, (i) this strategy has never been successfully implemented
            by a domestic air carrier which operates primarily with regional
            jets and (ii) Atlantic Coast faces significant challenges in
            establishing reservations, sales and marketing functions and in
            generating sufficient revenue while operating regional jets with
            limited passenger capacity.

      o     We believe Atlantic Coast's announced strategy to operate as an
            independent low-fare airline has contributed to a loss of value of
            33% between July 25, 2003, the last trading day prior to Atlantic
            Coast's announcement of its intention to become an independent
            low-fare airline, and July 29, 2003, the day after such
            announcement. During the period from July 1, 2003, through October
            3, 2003, the value of Mesa's common stock has increased
            approximately 49%. You are urged to obtain current market quotations
            for Mesa and Atlantic Coast common stock.

      o     The current Atlantic Coast board rejected the Mesa proposal even
            though Mesa stated in correspondence with the Chief Executive
            Officer and directors of Atlantic Coast that Mesa was interested in
            a business combination with Atlantic Coast that would provide a
            significant premium to you and that Mesa was willing to negotiate
            the terms and structure of any such business combination with the
            Atlantic Coast board.

      o     Atlantic Coast announced it entered into the Airbus MOU, creating
            further impediments to your ability to make your own decision
            regarding the future of Atlantic Coast's business, the Mesa exchange
            offer/merger proposal and any other business combination
            transaction.

Q:    WHO ARE THE NOMINEES?

A:    The nominees are Nathaniel A. Davis, Andre V. Duggin, Theodore F. Kahan,
      James R. Link, David T. McLaughlin, Peter F. Nostrand and Archille R.
      Paquette. The nominees are independent persons who are not affiliated with
      Mesa. The principal occupation and business experience of each nominee is
      set forth in this Consent Statement under the section entitled "Additional
      Information Regarding our Proposals"


                                      -4-


      beginning on page [ ], which we urge you to read. We believe you are
      entitled and it is in your best interest to give the nominees a chance to
      review the current strategy embarked on by the current Atlantic Coast
      board and an opportunity to maximize stockholder value.

Q:    WHY SHOULD ATLANTIC COAST COMBINE WITH MESA?

A:    If the current board of directors are replaced as a result of this Consent
      Statement, the new board will consider, if appropriate, an exchange offer
      or merger proposal from Mesa. We believe that an exchange offer or merger
      proposal made by Mesa should be attractive to Atlantic Coast stockholders
      for the following reasons:

      o     according to airline industry analysts, the outlook of Atlantic
            Coast on a stand-alone basis is not favorable due to the strategic
            decision by Atlantic Coast's current directors to abandon its
            profitable strategy of operating as a regional airline pursuant to
            revenue guarantee code share relationships with major airlines
            serving hub networks and transform itself into an independent
            low-fare airline;

      o     if we successfully complete the offer, you will hold shares in a
            larger combined company:

            o     which we believe will have greater access to capital to pursue
                  strategic growth opportunities than would Atlantic Coast on a
                  stand-alone basis;

            o     which we believe will become the leading regional airline in
                  the United States; and

            o     which we believe will create an enhanced capital structure and
                  a more liquid market for its shares than Atlantic Coast on a
                  stand-alone basis; and

      o     you will have the opportunity to continue to participate in Atlantic
            Coast's growth through your ownership of shares of Mesa common
            stock. Moreover, we expect that Mesa will be better positioned than
            Atlantic Coast on a stand-alone basis to develop and exploit
            Atlantic Coast's assets and partnerships.

      These benefits can be realized only upon the consummation of an exchange
      offer or merger proposal from Mesa. Accordingly, we recommend that you
      approve the 3 proposals contained in this Consent Statement so that the
      nominees can be seated as directors of Atlantic Coast and consider an
      exchange offer or merger proposal from Mesa and any alternative
      transaction that may be in your best interest. Mesa is considering the
      effects of the Airbus MOU on the value of Atlantic Coast, but continues to
      be committed to the Mesa exchange offer.

Q:    WHO CAN CONSENT TO THIS MATTER?

A:    If you owned shares of Atlantic  Coast  common  stock on [ ], 2003,  the
      record date, you have the right to consent to the proposals.

      Section 2.8 of the Atlantic Coast by-laws and Section 213 of the Delaware
      General Corporation Law ("DGCL") provide that any stockholder seeking to
      have the stockholders of Atlantic Coast authorize or take action by
      written consent is required to request that the Atlantic Coast board fix a
      record date. The Atlantic Coast board is required to promptly, but in all
      events within 10 days after the date on which the request is received,
      adopt a resolution fixing the record date for the solicitation (which may
      not be more than 10 days after the date of the resolution). If the
      Atlantic Coast board does not fix a record date within 10 days after the
      receipt of the request, the record date for the solicitation will be the
      date on which the first signed consent is delivered to Atlantic Coast.

      The Atlantic Coast board announced that it set October 23, 2003, as the
      record date for the solicitation made hereby and that it had received the
      first written consent in connection with the solicitation made hereby.
      This announcement was made not withstanding the fact that Mesa had not
      requested that a record date be set. On October 29, 2003, Mesa filed a
      lawsuit in the Court of Chancery of the State of Delaware (the "Delaware
      Lawsuit") seeking to require the Atlantic Coast board to comply with the
      proper procedures under Delaware law and the Atlantic Coast by-laws with
      respect to (i) fixing a record date for this consent solicitation and (ii)
      commencing the 60-day solicitation period. The Delaware Lawsuit alleges
      that the action taken by the Atlantic Coast board to set a record date of
      October 23, 2003, manipulates the proxy


                                      -5-


      solicitation process and impedes your ability to exercise your voting
      rights and may impede your right to receive superior value for your
      shares. On [ ], 2003, Mesa, in its capacity as a record holder of Atlantic
      Coast common stock, requested that the Atlantic Coast board fix a proper
      record date. If the Atlantic Coast board does not set a new record date in
      accordance with our request, the actual record date will not be determined
      until the Delaware Lawsuit has been resolved. We intend to notify you by
      press release as promptly as possible of the actual record date when
      determined.

      If the Delaware Lawsuit is unsuccessful, the record date for the consent
      solicitation hereby will be October 23, 2003.

Q:    WHEN IS THE DEADLINE FOR SUBMITTING CONSENTS?

A:    Section 228 of the DGCL requires that, in order for the proposals to be
      adopted, Atlantic Coast must receive written consents signed by a
      sufficient number of stockholders to adopt the proposals within 60 days of
      the date of the earliest dated consent being delivered to Atlantic Coast.
      Although Mesa had not yet commenced this consent solicitation, on October
      23, 2003, Atlantic Coast announced that it had received the first signed
      consent. As described above, Mesa has filed the Delaware Lawsuit to (i)
      require that Atlantic Coast set a proper record date and (ii) establish
      the appropriate date for commencement of the 60-day solicitation period.
      The deadline for submitting consents will not be determined until the
      Delaware Lawsuit has been resolved. We intend to notify you by press
      release as promptly as possible of the actual deadline for submitting
      consents. However, because the proposals will become effective upon our
      delivery to Atlantic Coast of valid and unrevoked consent cards totaling
      more than 50% of the outstanding shares of common stock as of the record
      date, and because this may occur before the expiration of the 60-day
      period, WE URGE YOU TO ACT PROMPTLY to assure that your vote will count.

Q:    HOW MANY SHARES MUST BE VOTED IN FAVOR OF THE PROPOSALS TO EFFECT THEM?

A:    We  must  receive  the  consents  of  a  majority  of  Atlantic  Coast's
      outstanding shares of common stock for the proposals to be adopted. As of
      November 1, 2003, Atlantic Coast had 45,333,310 shares of common stock
      outstanding. Therefore, based on available information, we estimate that
      the consent of at least 22,666,656 shares is necessary to effect the
      proposals. Abstentions, failures to consent and broker non-votes will have
      the same effect as withholding consent. Mesa owns beneficially 1,603,529
      shares of Atlantic Coast common stock, which it intends to vote in favor
      of the proposals. Consequently, at least 21,063,127 additional shares will
      need to consent to the proposals in order for them to be adopted.

Q:    WILL PROPOSAL 1 BE EFFECTIVE IF PROPOSAL 2 IS NOT ALSO ADOPTED?

A:    No. In order for either  proposal 1 or proposal 2 to be effective,  both
      must be adopted by the Atlantic Coast stockholders. In other words, a vote
      to remove the present board will not be effective unless the nominees also
      are elected. Proposals 1 and 2 may be adopted and become effective
      independent of proposal 3, and proposal 3 may be adopted and become
      effective independent of proposals 1 and 2.

Q:    WHAT SHOULD YOU DO TO CONSENT?

A:    Sign,  DATE  and  return  the  enclosed  WHITE  consent  card  TODAY  to
      MacKenzie  in the  envelope  provided.  In order for your  consent to be
      valid, it must be dated.

Q:    IF YOU CONSENT TO THE  PROPOSALS,  ARE YOU ACCEPTING  EITHER AN EXCHANGE
      OFFER OR A MERGER PROPOSAL?

A:    No. If the proposals are adopted,  the nominees will consider,  in their
      independent  judgment and good faith,  taking action to provide you with
      the opportunity to make your own decision  regarding any exchange offers
      or merger  proposals  from Mesa  (which we have  indicated  we are still
      committed to making) and any alternative proposals.


                                      -6-


Q:    HOW DOES SECTION 203 OF THE DELAWARE GENERAL  CORPORATION LAW AFFECT THE
      MESA EXCHANGE OFFER/MERGER PROPOSAL?

A:    Atlantic Coast is subject to the Delaware anti-takeover law, which
      provides that certain business combinations, including the transactions
      contemplated by a Mesa exchange offer/merger proposal, between a Delaware
      corporation whose stock is traded on the Nasdaq Stock Market, Inc., such
      as Atlantic Coast, and an interested stockholder (generally defined as a
      stockholder who beneficially owns 15% or more of a Delaware corporation's
      voting stock) are prohibited for a three-year period following the date
      that such stockholder became an interested stockholder, unless certain
      exceptions apply.

      If elected to the Atlantic Coast board, we believe that the nominees will
      consider taking board action to exempt an exchange offer or merger
      proposal from Mesa, or any other proposed transaction that they believe to
      be in your best interest, from the restrictions of the Delaware
      anti-takeover law.

Q:    WHAT ARE THE  MOST  SIGNIFICANT  CONDITIONS  TO THE  CONSUMMATION  OF AN
      EXCHANGE OFFER FROM MESA?

A:    If Mesa commences an exchange offer with respect to Atlantic Coast, such
      transaction will be conditioned upon, among other things, (i) there being
      validly tendered and not withdrawn prior to the expiration date that
      number of shares of Atlantic Coast common stock so that, after the
      completion of the exchange offer, Mesa owns a majority of the then
      outstanding shares of Atlantic Coast common stock on a fully-diluted
      basis; (ii) the registration statement pursuant to which Mesa will offer
      its common stock to Atlantic Coast stockholders being declared effective
      by the SEC; (iii) the shares of Mesa common stock to be issued in an
      exchange offer by Mesa being approved for listing on the Nasdaq Stock
      Market, Inc.; (iv) the expiration or termination of any waiting periods
      under the Hart-Scott-Rodino Improvements Act of 1976 and any other
      applicable laws and regulations; (v) the approval of an amendment to
      Mesa's articles of incorporation to increase its authorized share capital
      and the approval of the issuance of shares of Mesa common stock pursuant
      to the exchange offer by the stockholders of Mesa; (vi) Atlantic Coast's
      board of directors redeeming the poison pill or our being satisfied, in
      our sole discretion, that the poison pill has been invalidated or amended
      so as not to be applicable to the exchange offer or subsequent merger;
      (vii) the absence of any event that would be expected to have an adverse
      effect on Atlantic Coast such that, regardless of the circumstances, in
      our good faith judgment, it would be inadvisable to proceed with the
      exchange offer; (viii) Mesa being satisfied, in its sole discretion, that,
      after the consummation of an exchange offer, the provisions of the
      Delaware anti-takeover law would not prohibit for any period of time, or
      impose any voting requirements in excess of majority stockholder approval
      with respect to, a subsequent business combination; (ix) Mesa having
      entered into an agreement with United Airlines regarding Atlantic Coast's
      code share agreement substantially consistent with the terms of the United
      MOU; (x) Delta Air Lines not having terminated its code share agreement
      with Atlantic Coast (other than for performance) and/or having entered
      into a new code share agreement with Atlantic Coast on commercially
      reasonable terms acceptable to the parties and (xi) the absence of legal
      or other impediments to the consummation of the exchange offer or
      subsequent merger.

Q:    WHO SHOULD YOU CALL IF YOU HAVE QUESTIONS ABOUT THE SOLICITATION?

A:    Please call MacKenzie toll free at (800) 322-2885.

                    REASONS FOR THE SOLICITATION OF CONSENTS

      Mesa is soliciting your consent to the proposals because we believe that
the current members of the Atlantic Coast board have embarked on a misguided
strategy that has contributed to a steep decline in the value of Atlantic
Coast's common stock and therefore have failed to act in your best interest.
Mesa believes this is the case based on the following:

      o     Atlantic Coast has announced its intention to transform itself from
            a regional airline operating pursuant to revenue guarantee code
            share relationships with major airlines serving hub networks to an
            independent low-fare airline. According to airline industry
            analysts, (i) this strategy has never been successfully implemented
            by a domestic air carrier which operates primarily with regional
            jets and (ii) Atlantic Coast faces significant challenges in
            establishing reservations, sales and marketing functions and in
            generating sufficient revenue while operating regional jets with
            limited passenger capacity.


                                      -7-


      o     We believe Atlantic Coast's announced strategy to operate as an
            independent low-fare airline has contributed to a loss of value of
            33% between July 25, 2003, the last trading day prior to Atlantic
            Coast's announcement of its intention to become an independent
            low-fare airline, and July 29, 2003, the day after such
            announcement. During the period from July 1, 2003, through October
            3, 2003, the value of Mesa's common stock has increased
            approximately 49%. You are urged to obtain current market quotations
            for Mesa and Atlantic Coast common stock.

      o     The current Atlantic Coast board rejected the Mesa proposal even
            though Mesa stated in correspondence with the Chief Executive
            Officer and directors of Atlantic Coast that Mesa was interested in
            a business combination with Atlantic Coast that would provide a
            significant premium to you and that Mesa was willing to negotiate
            the terms and structure of any such business combination with the
            Atlantic Coast board.

      o     Atlantic Coast announced it entered into the Airbus MOU, creating
            further impediments to your ability to make your own decision
            regarding the future of Atlantic Coast's business, the Mesa exchange
            offer/merger proposal and any other business combination
            transaction.

      Therefore, we believe that all the current directors should be removed and
replaced with a board that will act in your best interest. Mesa believes that
the adoption of the proposals will accomplish this goal.

                     BACKGROUND OF THIS CONSENT SOLICITATION

      A number of developments and opportunities have led to our decision to
undertake this consent solicitation at the present time. We believe that the
removal of the current Atlantic Coast board of directors and the election of the
nominees as directors of Atlantic Coast will be beneficial to the stockholders
of Atlantic Coast. By consenting to the 3 proposals contained in this Consent
Statement, Atlantic Coast stockholders will be electing directors who will
consider returning Atlantic Coast to its historically profitable business
strategy of operating as a regional airline pursuant to revenue guarantee code
share agreements with major airlines serving hub networks, as well as the
removal of any impediments to the consideration of a business combination
transaction with Mesa or other strategic partners. We believe that if the
nominees enter into a business combination transaction with Mesa, Atlantic Coast
stockholders would receive a premium for their shares and would hold shares of a
combined company that would have:

      o     a potential to realize synergies, cost savings and risk
            diversification opportunities;

      o     a potential for increased operational efficiency and flexibility;
            and

      o     a potential to provide lower costs to strategic partners.

      These benefits will not be realized unless a Mesa/Atlantic Coast business
combination transaction is consummated.

      Our board of directors determined at a telephonic meeting held on October
4, 2003 that it was in the best interest of Mesa and its stockholders to proceed
with the Mesa exchange offer/merger proposal. The board authorized us to propose
the business combination through an offer in which Atlantic Coast's common
stockholders would be offered 0.90 of a share of Mesa common stock for each
share of Atlantic Coast common stock they own. The exchange for Mesa common
stock was expected to be tax-free to Atlantic Coast stockholders.

      In announcing the Mesa proposal, our board believed that greater value
could be achieved for both Mesa and Atlantic Coast stockholders by combining
Mesa's financial strength, management experience and business strategy with
Atlantic Coast's attractive assets and operations. In the Mesa board's judgment,
with our larger asset base, earnings potential and cash flow, the combined
company would have more efficient access to capital and improved operations to
execute its strategic plans.

      On October 6, 2003, Jonathan G. Ornstein, Mesa's Chief Executive Officer,
delivered a letter to Atlantic Coast's Chief Executive Officer, Kerry B. Skeen,
and Atlantic Coast's board of directors, outlining our intention to enter into a
business combination transaction with Atlantic Coast and indicating that we were
prepared to be flexible


                                      -8-


on deal terms and structure. Simultaneously, we issued a press release
disclosing to the public the Mesa proposal and its material terms. The following
is the text of Mr. Ornstein's letter to Mr. Skeen and the Atlantic Coast board
of directors:

   -----------------------------------------------------------------------------

                                          October 6, 2003

   Mr. Kerry B. Skeen
   Chairman and Chief Executive Officer
   Atlantic Coast Airlines Holdings, Inc.
   45200 Business Court
   Dulles, Virginia  20166

   Dear Kerry,

         I tried to reach you this morning to tell you first hand about our
   intentions. Mesa Air Group, Inc. ("Mesa Air") believes that a combination
   with Atlantic Coast Airlines Holdings, Inc. ("ACA" or the "Company") is
   compelling and in the best interests of both companies, our respective
   shareholders, employees and customers. While we have reviewed only publicly
   available data to this point, we are prepared to move forward promptly with a
   business combination between the two companies.

         Accordingly, Mesa Air is seeking to enter into an agreement with ACA to
   acquire all the outstanding stock of ACA in a tax-free transaction whereby
   Mesa Air would issue 0.9 of a share of its common stock for each ACA share.
   Based on our closing share price of $12.55 and based on ACA's closing share
   price of $9.02 on October 3, 2003, our offer represents a premium to your
   shareholders of 25% over the current value of their shares. This price also
   represents a premium of 35% over the average closing price of ACA since late
   July, and we believe shares in the combined company will provide exceptional
   future value to the ACA shareholders.

         There are clear strategic benefits. A combination would form the basis
   to leverage each company's assets, franchise, partners and management
   expertise to better position the combined company in today's competitive
   marketplace. It is clear that such a transaction would enable us to service
   the needs of our airline partners more efficiently and profitably. If we can
   realize only a small portion of the potential strategic benefits, we believe
   our combined earnings could improve by over 25%. Furthermore, our focus will
   remain in the business of providing cost effective regional feed for our
   airline partners.

         Our proposal will be subject to only customary conditions, including
   among others, obtaining necessary regulatory approvals, the redemption of the
   ACA Right's Plan in accordance with its terms, the completion of satisfactory
   due diligence, negotiation of definitive agreements and necessary shareholder
   approvals.

         Although we are offering a full and fair price to ACA shareholders, we
   may have flexibility on deal terms and structure if you are willing to work
   with us towards consummating a transaction. In connection with our proposal,
   we have retained Cadwalader, Wickersham & Taft LLP as counsel and Merrill
   Lynch & Co. as financial advisor.

         In light of the compelling benefits to our respective shareholders and
   the materiality of this proposal, we are publicly releasing the text of this
   letter. Our strong preference would be to work with you to reach a mutually
   acceptable transaction. I would be happy to meet with you or to meet with
   your Board at its convenience to discuss in greater detail our thoughts with
   respect to a possible business combination and the future role that you and
   your management team would have in the combined entity. I look forward to
   hearing from you or one of your representatives as soon as possible.


                                    Sincerely,
   -----------------------------------------------------------------------------


                                      -9-


                                    /s/ Jonathan G. Ornstein
                                    Jonathan G. Ornstein
                                    Chairman of the Board & Chief Executive
                                    Officer

   cc:  Board of Directors, ACA
   -----------------------------------------------------------------------------

      On October 6, 2003, Atlantic Coast issued a press release confirming that
it had received the letter from Mr. Ornstein containing the Mesa proposal. The
press release claimed that Atlantic Coast's board of directors was considering
the Mesa proposal, and indicated that Atlantic Coast was continuing with the
implementation of its plans to operate as an independent low-fare airline.

      On October 14, 2003, Mr. Ornstein wrote a second letter to the Atlantic
Coast board of directors expressing our disappointment and asking your board to
remove the poison pill so we could make a proposal directly to you. A copy of
Mr. Ornstein's letter dated October 14, 2003, is set forth below.

--------------------------------------------------------------------------------

                                      October 14, 2003

Board of Directors
Atlantic Coast Airlines Holdings, Inc.
45200 Business Court
Dulles, Virginia, 20166

Ladies and Gentlemen:

      We are very disappointed that we have not received a response from Mr.
Skeen or the Board of Directors of Atlantic Coast Airlines Holdings, Inc.
("ACA") to our letter of October 6, 2003 outlining an acquisition proposal for
ACA. Specifically, we proposed that Mesa Air Group, Inc. ("Mesa") acquire all of
the outstanding stock of ACA in a tax-free transaction whereby Mesa would issue
0.9 of a share of its common stock for each ACA share of common stock. We now
feel compelled to direct this proposal to the ACA board of directors.

      We have made a full and fair proposal to merge with ACA based on a proven
strategy of long-term profitability. Our focused business model, based on
revenue-guarantee codeshare relationships with major airlines serving hub
networks, applied to an enlarged asset base and a broader portfolio of client
partnerships, will offer more balanced revenue distribution and strong
synergies. As the leading operator in the regional aviation sector, we would
have greater access to capital to fund our combined growth. Employees of both
companies would have a stronger, more secure employer and greater advancement
opportunities; our major airline customers would benefit from our ability to
provide lower cost services; our shareholders an enhanced capital structure.
Consequently, we believe that both Mesa and ACA shareholders, who would receive
shares of Mesa common stock in the transaction, will benefit from our successful
execution of the merger.

      We and our advisors are prepared to send you a merger agreement and
promptly sit down to discuss all aspects of our current thinking on the terms
and structure of the transaction. We are committed to working with you to
negotiate a definitive agreement and to complete this transaction as soon as
practicable thereafter.

      Although it is our desire to enter into direct discussions about this
transaction with you, because Mr. Skeen has not responded to my letter, we are
now taking steps to give ACA shareholders the opportunity to replace existing
directors with those who are committed to fairly considering our offer or any
similarly attractive alternative that they believe is in the best interests of
ACA shareholders. As you know, ACA currently has in place a "poison pill" which
effectively prevents us from consummating an exchange offer directly with your
shareholders. We therefore urge you to remove the "poison pill" and allow your
shareholders the opportunity to voice their opinion on this transaction.

      Because we have not yet received a response to our proposal, we are filing
with the Securities and Exchange Commission the necessary documents to commence
a shareholder consent solicitation to replace ACA's


                                      -10-


--------------------------------------------------------------------------------
current Board of Directors with independent directors who we believe will give
fair consideration to our attractive proposal. We also intend to file with the
SEC an offer to exchange Mesa shares directly with ACA shareholders.

                                 Sincerely,

                                 /s/ Jonathan G. Ornstein
                                 Jonathan G. Ornstein
                                 Chairman of the Board & Chief Executive Officer

--------------------------------------------------------------------------------

      On October 14, 2003, Atlantic Coast issued a press release advising you to
take no action in response to our announcement of our intent to commence the
Mesa exchange offer/merger proposal. The press release claimed that Atlantic
Coast's board of directors would consider the Mesa exchange offer/merger
proposal.

      On October 23, 2003, Atlantic Coast (i) issued a press release announcing
that its board of directors had decided to reject our offer and reaffirmed its
strategy to establish a new, independent low-fare airline, (ii) filed with the
SEC a preliminary proxy statement urging you to reject the proposals set forth
in this Consent Statement and (iii) issued a press release announcing that it
has set October 23, 2003 as the record date for the solicitation made hereby and
that it had received the first written consent in connection with the
solicitation made hereby.

      On October 24, 2003, Mesa issued a press release in response to the
Atlantic Coast announcement that its board of directors had rejected our
acquisition proposal, reaffirming our commitment to the validity, prudence and
sufficiency of our acquisition proposal, as well as acknowledging our
disappointment in the management and board of directors of Atlantic Coast.

      On October 28, 2003, Atlantic Coast filed a complaint against Mesa in the
United States District Court for the District of Columbia alleging that Mesa has
made materially false and misleading statements and omissions in violation of
the federal securities laws in connection with its proposed consent solicitation
and potential exchange offer. Atlantic Coast's complaint alleges, among other
things, that (i) Mesa failed to disclose United Airlines as a participant in its
consent solicitation and proposed transaction; (ii) Mesa's bid to acquire all of
Atlantic Coast's outstanding stock is motivated by its desire to use Atlantic
Coast's cash on hand to resolve Mesa's difficulties in obtaining financing for
additional aircraft purchases; (iii) Mesa Chief Executive Officer Jonathan
Ornstein and other Mesa insiders sold a substantial number of Mesa shares in
September 2003, shortly before Mesa announced its takeover bid of Atlantic
Coast; (iv) other stock transactions produced short-swing profits subject to
Section 16(b) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), which requires a corporate insider to disgorge any profit from such
transactions; (v) Mesa's directors, who have determined that an acquisition of
Atlantic Coast would be in Mesa's best interest and are proposing a transaction
in which the stockholders of Atlantic Coast would receive shares of Mesa common
stock, are not sufficiently independent and have engaged in self-dealing; and
(vi) several of Mesa's nominees to Atlantic Coast's board of directors are
subject to conflicts of interest that would impair their ability to fulfill
their fiduciary obligations to Atlantic Coast.

      Atlantic Coast in its complaint seeks to (i) obtain a declaration that
Mesa's Consent Statement as well as our other statements in conjunction with our
proposed consent solicitation violate Section 14(a) of the Exchange Act and SEC
Rule 14a-9; (ii) obtain a declaration that Mesa's Consent Statement as well as
our other statements in conjunction with our proposed consent solicitation and
exchange offer violate Section 14(e) of the Exchange Act; (iii) require Mesa to
correct our alleged material misstatements and omissions; (iv) enjoin Mesa from
disseminating our Consent Statements and from making material misstatements or
omissions; and (v) enjoin Mesa from making a proxy consent solicitation and/or
tender offer to Atlantic Coast's stockholders. We believe the Atlantic Coast
lawsuit is without merit, and we intend to contest the allegations set forth in
Atlantic Coast's complaint.

      On October 29, 2003, Mesa filed the Delaware Lawsuit seeking to require
the Atlantic Coast board to comply with the proper procedures under Delaware law
and the Atlantic Coast by-laws with respect to (i) fixing a record date for this
consent solicitation and (ii) commencing the 60-day solicitation period. The
Delaware Lawsuit


                                      -11-


alleges that the action taken by the Atlantic Coast board to set a record date
of October 23, 2003 impedes your ability to exercise your voting rights and may
impede your right to receive superior value for your shares.

      On October 31, 2003, Mesa asked Atlantic Coast for its stockholder list
and security position listing in order to communicate with stockholders and to
distribute this Consent Statement to the Atlantic Coast stockholders.

      On November 13, 2003, Mr. Ornstein wrote another letter to the Atlantic
Coast board of directors asking your board to not take any action that would
make it more difficult or expensive for you to consider the Mesa exchange
offer/merger proposal. A copy of Mr. Ornstein's letter, which we released
publicly, dated November 13, 2003, is set forth below.


                                      -12-


--------------------------------------------------------------------------------
                                           November 13, 2003

Board of Directors
Atlantic Coast Airlines Holdings, Inc.
45200 Business Court
Dulles, Virginia, 20166

Ladies and Gentlemen:

      As you are aware, we announced yesterday that we have entered into a
memorandum of understanding (MOU) with United Air Lines, Inc. ("United
Airlines") which provides that Mesa Air will provide or cause Atlantic Coast
Airlines Holdings, Inc. ("ACA") to provide for the operation of regional jet and
turboprop aircraft in code-share service under the United Express mark in the
event that Mesa Air is successful in its acquisition of ACA. If Mesa Air's
nominees are elected pursuant to our consent solicitation, they will have the
right to consider the proposal set forth in the above mentioned MOU.

      Your stockholders are in a truly unique position today. Very rarely are
the stockholders of a publicly held corporation offered such a stark and
contrasting choice of strategic courses. One vision, as articulated by your
management, is to sever the historically stable and profitable relationship with
UAL enjoyed by ACA as an alliance partner and pursue the course of a "startup",
low cost air carrier with all risks attendant thereto. Your management's actions
ignore, in our opinion, conclusions of leading Wall Street financial analysts
who consider the financial projections to be questionable. Another vision,
represented by Mesa's proposal, is to return ACA to what it has done best:
provide high quality regional air service to major airlines under long-term
revenue guaranty agreements. From our vantage point, the choice is
straightforward and simple.

      We believe that your stockholders are entitled to decide the future of a
company in this situation. Accordingly, in our opinion, any action taken by you
to impede the ability of your stockholders to make this fundamental choice or to
receive a premium for their shares may cause irreparable damage to ACA and
stockholder value.

      In that regard, both as a significant shareholder and potential bidder for
ACA, we are very concerned that in light of your recent announcements you may
choose to impede your stockholders ability to continue as a regional carrier by
committing to the purchase of inappropriate aircraft. We believe that entering
into an aircraft purchase commitment or taking other action that would preclude
your stockholders from fairly considering the exchange offer/merger proposal we
have previously communicated to you would constitute an impermissible "shark
repellant" and would be inconsistent with your fiduciary duties under Delaware
law. We believe that by entering into any binding aircraft purchase agreement
with penalty clauses or non-refundable deposits the ACA board would be wasting
valuable corporate assets and would be acting contrary to the best interests of
its stockholders solely for the purpose of entrenching yourselves and
management. I am sure you have heard and will continue to hear from your
shareholders on this issue.

      We urge you to not take any action that would make it more difficult or
expensive for stockholders to consider our proposal and receive the premium that
would result. We will take such action as is necessary to protect ACA
stockholder value and insure that you comply with your fiduciary duty to the ACA
stockholder, including us.


                                          Sincerely,

                                          /s/ Jonathan G. Ornstein
                                          --------------------------------------

                                          Jonathan G. Ornstein
                                          Chairman of the Board & Chief
                                          Executive Officer
--------------------------------------------------------------------------------


                                      -13-


      On November 13, 2003, Atlantic Coast issued a press release which included
a letter to the Mesa board of directors in response to the above letter Mesa
sent to Atlantic Coast's board of directors. Atlantic Coast's letter to Mesa
stated that it takes its fiduciary duties to its stockholders seriously. The
letter further stated that the Atlantic Coast board of directors has previously
reviewed and rejected an agreement with United Airlines for the following
reasons: (i) greater risk over the life of the contract, particularly with
respect to costs that would be required to be borne by Atlantic Coast but that
would be solely within United Airlines' control; (ii) margins based on operating
performance standards that could be reset by United Airlines in its discretion;
and (iii) no assurance that the terms of the non-binding agreement would not be
renegotiated by United Airlines when and if it finalizes its reorganization plan
and actually emerges from bankruptcy.

      On November 17, 2003, Mr. Ornstein wrote a letter to the Atlantic Coast
board of directors in response to Atlantic Coast's letter dated November 13,
2003. A copy of Mr. Ornstein's letter is set forth below.

--------------------------------------------------------------------------------

                                           November 17, 2003

Board of Directors
Atlantic Coast Airlines Holdings, Inc.
45200 Business Court
Dulles, Virginia, 20166

Ladies and Gentlemen:

      I am in receipt of your letter dated November 13, 2003.

      Firstly, let me say that we are delighted with the results of the
non-binding memorandum of understanding (MOU) that we have recently negotiated
with United Airlines (UAL). The concerns raised in your above-mentioned letter
with respect to certain contract terms previously offered by UAL to Atlantic
Coast Airlines Holdings, Inc. ("ACA"), while interesting, are not particularly
relevant to the Mesa-negotiated version of the MOU. Simply stated, your concerns
are either unfounded or have been addressed satisfactorily.

      Finally, contrary to your management's self-serving and incorrect
conclusion that we are working with UAL to try to "squash" your efforts to
establish a low-fare airline at Dulles International Airport, please be assured
that the MOU was negotiated with UAL on an arms length basis with the view to
effecting the acquisition of ACA. The terms of the MOU are in our view in the
best interests of the stockholders of ACA and the combined company in the event
a business combination transaction between ACA and Mesa is consummated.

                                   Sincerely,

                                   /s/ Jonathan G. Ornstein
                                   ---------------------------------------------

                                   Jonathan G. Ornstein
                                   Chairman of the Board & Chief Executive
                                   Officer

--------------------------------------------------------------------------------

      On November 18, 2003, Atlantic Coast issued a press release announcing
that it had entered into the Airbus MOU. Atlantic Coast took such actions
despite being informed in our letter of November 13, 2003 of our belief that by
entering into binding aircraft purchases which contain penalty clauses or
non-refundable deposits, the Atlantic Coast board would be acting contrary to
the best interests of its stockholders.

      On November 19, 2003, Mesa issued a press release denouncing the recent
aircraft order by Atlantic Coast. Mesa also announced we are moving forward with
our consent solicitation to replace the current board of Atlantic Coast with the
nominees. Mesa also intends to proceed with our previously announced exchange
offer/merger


                                      -14-


proposal, subject to considering the impact of these developments on the value
of Atlantic Coast and consequently our offer.

                              MESA AIR GROUP, INC.

      Mesa is a holding company whose principal subsidiaries operate as regional
air carriers providing scheduled passenger and airfreight service. Mesa serves
163 cities in 40 states, the District of Columbia, Canada, and Mexico. Mesa
operates a fleet of 150 aircraft and has approximately 938 daily system
departures. Mesa operates in the West and Midwest as America West Express; the
Midwest and East as US Airways Express; in Denver and the West as United
Express; in Denver as Frontier JetExpress until December 31, 2003; in Kansas
City with Midwest Express and in New Mexico and Texas as Mesa Airlines. Mesa,
which was founded in New Mexico in 1982, has approximately 4,000 employees. Mesa
is a member of the Regional Airline Association and Regional Aviation Partners.

      Mesa is a Nevada corporation with its principal executive offices located
at 410 North 44th Street, Suite 700, Phoenix, Arizona 85008.

      Mesa files annual, quarterly and special reports, proxy statements and
other information with the SEC. You may read and copy any reports, statements or
other information we file at the SEC's public reference room in Washington, D.C.
Our SEC filings are also available to the public from commercial document
retrieval services and at the website maintained by the SEC at
"http://www.sec.gov." We intend to file a registration statement on Form S-4 to
register the shares of common stock of Mesa to be exchanged for shares of
Atlantic Coast common stock in the Mesa exchange offer/merger proposal and
preliminary proxy materials with the SEC so as to obtain necessary approval for
the issuance of the shares of Mesa common stock to the stockholders of Atlantic
Coast when the Mesa exchange offer/merger proposal is consummated.

                              MESA STRATEGIC PLANS

      If the nominees are elected to the Atlantic Coast board of directors, they
will consider entering into a business combination transaction with Mesa if such
a transaction is in the best interest of Atlantic Coast stockholders.

      If Mesa is successful in acquiring Atlantic Coast, Mesa will take
immediate steps to refocus Atlantic Coast's business model to one based on
revenue guarantee code share relationships with major airlines serving hub
networks. We believe that by bringing these two companies together, and
maintaining the successful revenue guarantee code share business model, we will
create the leading regional airline in the United States. In our view, this
business model, applied to an enlarged asset base and a broader portfolio of
client partnerships, will offer more balanced revenue distribution and strong
synergies. As the leading operator in the regional aviation sector, we would
have a stronger balance sheet and greater access to capital to fund our combined
growth. Employees of both companies would have a stronger, more secure employer
and greater advancement opportunities; our major airline customers would benefit
from our ability to provide cost efficient services; our stockholders would
benefit from an enhanced capital structure and greater growth prospects.
Consequently, we believe the forgoing factors will enhance the company's
profitability and stockholder value, both in the short and long term.

      These benefits will not be realized unless a Mesa/Atlantic Coast business
combination transaction is consummated.

      We are engaged in preliminary discussions with Delta Air Lines regarding
the terms of a potential code share agreement in the event that Mesa is
successful in acquiring Atlantic Coast.

      Delta Air Lines has informed Atlantic Coast that if it operates aircraft
with more than 70 seats, Delta Air Lines may seek alternatives to the services
provided by Atlantic Coast. Delta Air Lines has the right under its code share
agreement with Atlantic Coast to terminate the agreement at any time without
cause by providing 180 days notice to Atlantic Coast, in which case Atlantic
Coast has the right to require Delta Air Lines to purchase and assume the lease
on all or some of the aircraft used in the code share agreement. Atlantic
Coast's binding memorandum of understanding with Airbus for A319 and A320
aircraft, which seat 132 passengers and 156


                                      -15-


passengers, respectively, could cause Delta Air Lines to terminate its code
share agreement with Atlantic Coast and could complicate Mesa's efforts to reach
a code share agreement with Delta Air Lines with respect to the operation of
Atlantic Coast aircraft in the event the Mesa exchange offer/merger proposal is
successfully consummated.

      On November 12, 2003, Mesa entered into the United MOU in which Mesa will
provide or would cause Atlantic Coast to provide for the operation of regional
jet and turboprop aircraft in code share and pro-rate service under the United
Express mark in the event that the Mesa exchange offer/merger proposal is
successfully consummated or if the Mesa nominees are elected to the Atlantic
Coast board of directors pursuant to this consent solicitation and enter into a
definitive code share agreement with United Airlines on terms substantially
similar to those contained in the United MOU. The United MOU contemplates: (i)
the use of 87 RJ50s for terms expiring as late as December 31, 2015; (ii) the
use of 12 Contract J41 Turboprops and the right to fly up to 16 Pro-Rate
Turboprops, all 28 aircraft for a term through the expiration of their
respective leases; and (iii) a conversion option pursuant to which 30 of the 87
RJ50s may be substituted for RJ70s. The United MOU also ensures cost
reimbursement for any contractual commitments with respect to outsourced
maintenance, pilots, flight attendants, line mechanics and dispatchers, as well
as Atlantic Coast receiving profit margins with respect to all contract aircraft
except Pro-Rate J41 Turboprops. The profit margins to be received by Atlantic
Coast are based on performance criteria and will be adjusted to margins that,
although a reduction from Atlantic Coast current margins, are no less favorable
than the profit margins to be received by any other regional carrier pursuant to
recently negotiated code share agreements with United Airlines.

      In addition, Mesa negotiated the following modifications to its current
code share relationship with United Airlines: (i) an extended term with respect
to 15 Short-term RJ50s for up to 2 years at Mesa's discretion; (ii) the delivery
of both 10 Replacement RJ70s in lieu of 10 Long-term RJ50s, as well as the last
5 RJ70s under its current agreement, for a term expiring 10 years after the date
of delivery, but no later than 2018; and (iii) a right to fly up to 20 Beech
1900 Pro-Rate Turboprops in mutually agreeable markets at mutually agreeable
pro-rate terms. Furthermore, in the event that a Mesa/Atlantic Coast business
combination is successfully consummated or if the Mesa nominees are elected to
the Atlantic Coast board of directors pursuant to this consent solicitation and
enter into a definitive code share agreement with United Airlines on terms
substantially similar to those contained in the United MOU, the adjusted margins
will also apply to all Mesa aircraft that fly code share services for United
Airlines. The revised margins are an improvement in the current Mesa
relationship with United Airlines.

      In addition, the United MOU contemplates (i) the delivery of up to 10
Growth RJ70s after October 2006 with a term expiring on December 31, 2016; and
(ii) a right of first refusal on an Additional 10 Growth RJ70s. The allocation
between Mesa and/or Atlantic Coast of such aircraft will be determined by the
parties and set forth in a definitive agreement.

      The nominees have indicated that if elected to the Atlantic Coast board,
they will consider entering into a definitive code share agreement with United
Airlines on terms substantially similar to those contained in the United MOU.

                 ADDITIONAL INFORMATION REGARDING THE PROPOSALS

Proposal 1: Removal of Directors

      Atlantic Coast stockholders are being asked to adopt a proposal to remove
the current directors of Atlantic Coast: Kerry B. Skeen, Thomas J. Moore, C.
Edward Acker, Robert E. Buchanan, Susan MacGregor Coughlin, Caroline Devine,
Daniel L. McGinnis, James C. Miller III, and William Anthony Rice and any
director elected or appointed to the Atlantic Coast board pursuant to a vacancy
caused by the removal or resignation of any of the directors from the Atlantic
Coast board or any newly-created directorships prior to the effective time of
this stockholder action. As explained in this Consent Statement, Mesa strongly
believes that the current directors are not acting, and will not act, in the
best interest of the Atlantic Coast stockholders and should, therefore, be
removed.

      Proposal 1 will not become effective unless proposal 2 is adopted and
becomes effective. However, proposal 1 may be adopted and become effective
independent of proposal 3.


                                      -16-


      WE ARE SEEKING YOUR CONSENT TO REMOVE THE CURRENT DIRECTORS OF ATLANTIC
COAST WITHOUT CAUSE NOTWITHSTANDING SECTION 3.11 OF THE ATLANTIC COAST BY-LAWS,
WHICH PROVIDES THAT DIRECTORS MAY BE REMOVED ONLY FOR CAUSE. SECTION 141(K) OF
THE DGCL PROVIDES THAT DIRECTORS MAY BE REMOVED WITH OR WITHOUT CAUSE BY A
MAJORITY OF THE STOCKHOLDERS. WE HAVE BEEN ADVISED BY COUNSEL THAT SECTION 3.11
OF THE ATLANTIC COAST BY-LAWS CONFLICTS WITH SECTION 141(K) OF THE DGCL AND IS
THEREFORE INVALID. THE DELAWARE LAWSUIT SEEKS TO DECLARE SECTION 3.11 OF THE
ATLANTIC COAST BY-LAWS INVALID.

      Mesa urges Atlantic Coast stockholders to consent to the removal of all of
Atlantic Coast's directors.

Proposal 2: Election of Nominees

      Atlantic Coast stockholders are being asked to elect as directors of
Atlantic Coast each of the seven nominees named below, each of whom has
consented to being named in this Consent Statement and our other solicitation
materials and to serve as a director, if elected, until the next annual meeting
of stockholders or until his successor has been elected and qualified. The
Atlantic Coast by-laws provide that a single class of directors will be elected
at the annual meeting and hold office until the following annual meeting or
until his successor is elected and qualified. If elected, the nominees would
serve together as a single class of directors in accordance with these by-law
provisions.

      Mesa's primary purpose in seeking to elect the nominees to Atlantic
Coast's board is to enhance the value of Atlantic Coast for the benefit of all
stockholders. If elected, the nominees would be responsible for managing the
business and affairs of Atlantic Coast and would consider any and all feasible
alternatives to Atlantic Coast's current business operations and practices. Each
director of Atlantic Coast has an obligation under Delaware law to discharge his
duties as a director in good faith, in a manner he reasonably believes to be in
the best interest of Atlantic Coast and with such care, including reasonable
inquiry, skill and diligence, as a person of ordinary prudence would use under
similar circumstances.

      Although Mesa has no reason to believe that any of the nominees may be
unable or unwilling to serve as directors, if any of the nominees is unable to
serve as a director of Atlantic Coast due to death, disability or otherwise, the
remaining nominee or nominees may designate another person or persons to replace
the nominee or nominees unable to serve.


                                      -17-


      The name, age, present principal occupation and business address and
employment history of each of the nominees for at least the past five years are
as follows:
--------------------------------------------------------------------------------

                                         PRESENT PRINCIPAL OCCUPATION AND FIVE
             NAME                AGE            YEAR EMPLOYMENT HISTORY
--------------------------------------------------------------------------------

Nathaniel A. Davis                49    President, Chief Operating Officer, XO
                                        Communications, Inc. from 2000 through
                                        June 2003. Prior to June 2003, Mr. Davis
                                        also served as a director of XO
                                        Communications, Inc. From 1998 to 2000,
                                        Mr. Davis served as Vice President of
                                        Technical Services for Nextel
                                        Communications, Inc. Mr. Davis is
                                        currently a director of XM Satellite
                                        Radio Holdings, Inc.
--------------------------------------------------------------------------------

Andre V. Duggin                   58    Chairman of the Board of Directors and
A.V. Consultants, Inc.                  Chief Executive Officer of A.V.
985 Old Eagle School Road               Consultants, Inc., 1982 through the
Suite 504                               present.
Wayne, PA 19355
--------------------------------------------------------------------------------

Theodore F. Kahan                 41    Senior Managing Director, El Camino
El Camino Capital Group                 Capital Group, 2003. Mr. Kahan served as
130 S. El Monte Dr.                     Executive Vice President, Real Estate
Beverly Hills, CA 90212                 Investment, Davis Companies, 2000-2003.
                                        Mr. Kahan also served as General Counsel
                                        and a member of the executive management
                                        committee of American Golf Corp. from
                                        1995-2000.
--------------------------------------------------------------------------------

James R. Link                     58    Consultant, JLink Associates, a
2931 N. Governeour Street,              financial/marketing consulting firm,
Bldg C, Apt. 103                        from 2002 through the present. Mr. Link
Wichita, KS  67226                      has also served as Chief Executive
                                        Officer of PAC/AV from 2002 through the
                                        present and as Chief Executive Officer
                                        of TRW Investments, a venture capital
                                        firm, from 2002 through the present. Mr.
                                        Link served as Chief Executive Officer
                                        of Impulse Airlines in 2001. From 1998
                                        through 2001, Mr. Link served as Vice
                                        President, Worldwide Sales, of Raytheon
                                        Aircraft.
--------------------------------------------------------------------------------

David T. McLaughlin               71    Chairman of the Board of Directors,
                                        Orion Safety Products, 1988-2001 and
                                        Chief Executive Officer, 2001. Mr.
                                        McLaughlin served as President of
                                        Dartmouth College from 1981 through
                                        1987. Mr. McLaughlin currently serves on
                                        the Board of Directors of Viacom, Inc.,
                                        Orion Safety Products, and Infinity
                                        Broadcasting. Mr. McLaughlin is Chairman
                                        of the American Red Cross.
--------------------------------------------------------------------------------

Peter F. Nostrand                 56    Chairman of the Board of Directors,
Suntrust Banks, Inc.                    President and Chief Executive Officer,
303 Peachtree St., N.E.                 SunTrust Banks, Inc., Greater Washington
Atlanta, Georgia 30308                  (successor to Crestar Bank Greater
                                        Washington) from 1995 through the
                                        present. Mr. Nostrand served as
                                        President of Crestar Bank Washington,
                                        D.C. and Crestar Bank MD (both merged
                                        into Crestar's Virginia Bank) from 1991
                                        through 1996. From 1988 through 1995,
                                        Mr. Nostrand served as Senior Executive
                                        Vice President of Crestar Bank.
--------------------------------------------------------------------------------

Archille R. Paquette              60    Mr. Paquette has been retired since
                                        1999. Prior to his retirement, Mr.
                                        Paquette served in various positions at
                                        Air Midwest, Inc., joining Air Midwest,
                                        Inc. in 1977 and


                                      -18-


--------------------------------------------------------------------------------

                                         PRESENT PRINCIPAL OCCUPATION AND FIVE
             NAME                AGE            YEAR EMPLOYMENT HISTORY
--------------------------------------------------------------------------------
                                        serving as President and Chief Operating
                                        Officer from 1993 through 1999. Air
                                        Midwest, Inc. is a subsidiary of Mesa.
                                        Mr. Paquette served as an officer in the
                                        US Army from 1965-1975.
--------------------------------------------------------------------------------

      The following table sets forth all purchases and sales during the past two
years of Mesa common stock deemed to be beneficially owned by the nominees. All
transactions were effected in open market transactions. To the best of our
knowledge, none of the nominees beneficially owns any common stock of Atlantic
Coast.

                                   TRANSACTION    NUMBER OF
NAME                                  DATE          SHARES   PURCHASE/SALE

James R. Link                        5/19/03         200       Purchase

James R. Link                        6/24/03         800       Purchase

James R. Link                        7/22/03        1,000      Purchase

James R. Link                        9/2/03         1,000      Purchase

James R. Link                        9/19/03        1,500        Sale

James R. Link                        9/29/03        1,500        Sale

Archille R. Paquette(1)              3/8/02         2,100        Sale

Archille R. Paquette(1)              3/18/02        7,900        Sale

Archille R. Paquette(1)              3/28/02        10,000       Sale

Archille R. Paquette(1)              4/12/02        10,000       Sale

Archille R. Paquette(1)              4/16/02        5,000        Sale

(1) Cashless exercise of stock option and simultaneous sale.

      Except as discussed below, none of the nominees has been involved in any
legal proceedings which must be disclosed as material for purposes of an
evaluation of the integrity or ability of any person nominated to become a
director under the federal securities laws.

       NAME                              LEGAL PROCEEDINGS
-------------------      -------------------------------------------------------
Nathaniel A. Davis         In January 2002, shareholder lawsuits were filed
                           against the executive officers and board of directors
                           of XO Communications, Inc., including Mr. Davis,
                           alleging breaches of fiduciary duty in connection
                           with his position as President and Chief Operating
                           Officer of XO Communications, Inc. These cases were
                           dismissed in June 2002. XO Communications, Inc. was
                           the subject of an insolvency proceeding in the United
                           States Bankruptcy Court for the Southern District of
                           New York in 2002 and 2003 while Mr. Davis was an
                           executive officer.
                           -----------------------------------------------------

      This information has been furnished to Mesa by the respective nominees.
Each of the nominees has consented to being named herein to serve as a nominee
and as a director, if elected. None of the nominees nor any of their current
employers is an affiliate of Mesa and, if elected, none of the nominees would
represent Mesa on the Atlantic Coast board.


                                      -19-

      Mesa has agreed to indemnify and hold harmless, to the fullest extent
permitted by law, each of the nominees against expenses, judgments, fines and
amounts paid in settlement actually and reasonably incurred by him in connection
with his position as a nominee. Mesa will also pay out-of-pocket expenses of the
nominees incurred in their capacity as such. It is expected that each nominee,
if elected and seated on the Atlantic Coast Board, will thereafter be reimbursed
by Atlantic Coast, based on its current fee structure, for his reasonable
out-of-pocket expenses incurred in the performance of his service as director.
Such directors will also be entitled to indemnification by Atlantic Coast in
accordance with its certificate of incorporation and by-laws.

      Proposal 2 will not become effective unless proposal 1 is adopted and
becomes effective. However, proposal 2 may be adopted and become effective
independent of proposal 3.

      In accordance with applicable regulations of the SEC, the WHITE consent
card delivered with this Consent Statement provides each stockholder of Atlantic
Coast with the opportunity to designate the names of any of the nominees whom he
or she does not desire to elect to the Atlantic Coast board. Mesa urges Atlantic
Coast stockholders to vote for all of the nominees on the WHITE consent card
delivered with this Consent Statement.

Proposal 3: Repeal of Each Provision of the Atlantic Coast By-laws or
            Amendments, if any, Adopted After August 14, 1998 (the last date the
            by-laws were filed with the SEC) Prior to the Effective Time of this
            Stockholder Action

      Stockholders are being asked to adopt a proposal which would repeal any
amendment to the Atlantic Coast by-laws adopted by the current Atlantic Coast
board after August 14, 1998 and before the effectiveness of the proposals and
the seating of the nominees. This proposal is designed to prevent the current
Atlantic Coast directors from taking actions to amend the Atlantic Coast by-laws
to attempt to nullify or delay the actions taken by the stockholders under these
proposals or to create new obstacles to the ability of the stockholders to
freely elect a board of directors that act in their best interest. Based on
publicly available information, the most recent version of the Atlantic Coast
by-laws were adopted on July 22, 1998, and no alterations after that date have
been publicly disclosed. The approval of this proposal could result in the
repeal of by-laws which may be in the best interests of stockholders, although
we believe that such a possibility is unlikely in view of the failure of the
current board to disclose any such by-law amendments. If the current board
adopts any material amendments to the by-laws that would be subject to repeal
under this proposal and such amendments are made available to us or the general
public, we will provide you with additional materials regarding such amendments.
Proposal 3 may be adopted and become effective independent of proposals 1 and 2.

      Mesa urges Atlantic Coast stockholders to repeal any amendment to the
Atlantic Coast by-laws adopted by the current Atlantic Coast board after August
14, 1998 and before the effectiveness of the proposals and the seating of the
nominees.

                                VOTING SECURITIES

      According to Atlantic Coast's certificate of incorporation, the shares of
Atlantic Coast common stock constitute the only class of outstanding voting
securities of Atlantic Coast. Accordingly, only holders of Atlantic Coast common
stock are entitled to execute consents. Atlantic Coast stated in its Quarterly
Report on Form 10-Q for the quarter ended September 30, 2003, that as of
November 1, 2003, there were 45,333,310 shares of Atlantic Coast common stock
outstanding. Each share of Atlantic Coast common stock is entitled to one vote.
Stockholders of Atlantic Coast do not have cumulative voting rights. The record
date for determining stockholders entitled to consent is [ ], 2003.

      The following table sets forth the interests of Mesa in the shares of
Atlantic Coast, as of October 10, 2003.

                                      -20-



                                                       AMOUNT AND
                                                        NATURE OF
                       NAME OF                         BENEFICIAL  PERCENT OF
                   BENEFICIAL OWNER                     OWNERSHIP     CLASS
--------------------------------------------------     ----------  ----------
Mesa Air Group, Inc...............................     1,603,529      3.5%
  401 North 44th Street, Suite 700
  Phoenix, Arizona  85008

------------
The following table sets forth all purchases and sales by Mesa of Atlantic Coast
common stock during the past two years. All transactions were effected in open
market transactions.

     DATE OF          AMOUNT OF
   TRANSACTION        SECURITIES     TRANSACTION TYPE   PRICE PER SHARE
   -----------        ----------     ----------------   ---------------
     11/20/01            1,000             Sale              $19.18
     11/21/01            6,000           Purchase            $22.56
     11/21/01            1,000             Sale              $20.23
     11/23/01              100             Sale              $21.34
     11/23/01              900             Sale              $21.33
     11/26/01              300             Sale              $21.52
     11/26/01              400             Sale              $21.48
     11/26/01            1,300             Sale              $21.48
     12/10/01              100             Sale              $22.68
     12/10/01              900             Sale              $22.63
     01/07/02               50              Put              $20.00
     01/15/02            5,000             Sale              $25.66
     02/01/02              200             Sale              $28.88
     02/04/02              100             Sale              $29.24
     02/04/02            1,900             Sale              $29.29
     02/05/02               50              Put              $22.50
     02/06/02              600           Purchase            $26.46
     02/06/02              400           Purchase            $26.47
     02/07/02              900           Purchase            $25.44
     02/07/02              100           Purchase            $25.49
     02/07/02               25              Put              $25.00
     02/07/02               25              Put              $25.00
     02/07/02               25              Put              $25.00
     02/07/02               25              Put              $25.00
     02/28/02            3,000             Sale              $28.79
     03/08/02               25              Put              $25.00
     03/08/02               25              Put              $25.00
     03/08/02               10              Put              $22.50
     03/08/02               10              Put              $25.00
     03/12/02            2,000           Purchase            $27.51
     03/12/02              900           Purchase            $27.42
     03/12/02              300           Purchase            $27.49
     03/12/02              100           Purchase            $27.47
     03/12/02              100           Purchase            $27.45
     03/18/02            1,000           Purchase            $25.96
     03/18/02              900           Purchase            $25.95
     03/18/02              100           Purchase            $25.95
     03/22/02            2,000           Purchase            $25.67
     03/25/02            2,200           Purchase            $24.69
     03/26/02            2,000           Purchase            $24.15
     03/27/02            2,100           Purchase            $24.13


                                      -21-


     DATE OF          AMOUNT OF
   TRANSACTION        SECURITIES     TRANSACTION TYPE   PRICE PER SHARE
   -----------        ----------     ----------------   ---------------
     03/28/02            5,000           Purchase            $23.74
     04/02/02               40              Put              $22.50
     04/02/02               15              Put              $25.00
     04/04/02            5,500           Purchase            $22.83
     02/04/03           10,000           Purchase             $8.66
     04/07/03            2,000             Sale               $7.30
     04/30/03            8,000             Sale               $8.21
     08/04/03           20,000           Purchase             $7.33
     08/05/03           42,200           Purchase             $7.33
     08/06/03           75,092           Purchase             $7.54
     08/07/03           68,994           Purchase             $7.41
     08/08/03            2,300           Purchase             $7.50
     08/08/03            1,386             Sale               $8.04
     08/08/03           17,200             Sale               $8.01
     08/11/03            5,000             Sale               $8.35
     08/12/03           10,000             Sale               $8.44
     08/13/03            3,000           Purchase             $8.20
     08/14/03          185,000           Purchase             $7.95
     08/14/03            5,000           Purchase             $8.01
     08/14/03            4,500           Purchase             $7.89
     08/21/03           62,000           Purchase             $8.16
     08/21/03           22,656           Purchase             $8.16
     08/22/03          168,000           Purchase             $8.12
     08/25/03           40,000           Purchase             $7.62
     08/25/03          100,600           Purchase             $7.81
     08/26/03            2,500           Purchase             $7.80
     08/26/03            4,000           Purchase             $7.85
     08/27/03           92,500           Purchase             $7.95
     08/27/03           35,800           Purchase             $7.88
     08/28/03           61,577           Purchase             $7.88
     08/29/03           37,500           Purchase             $8.03
     08/29/03            7,000           Purchase             $7.97
     09/02/03          117,500           Purchase             $8.11
     09/02/03            9,100           Purchase             $8.21
     09/03/03           30,000             Sale               $8.71
     09/04/03           20,000             Sale               $8.60
     09/04/03            4,500             Sale               $8.69
     09/05/03           30,000             Sale               $8.77
     09/08/03          221,000           Purchase             $8.48
     09/09/03            3,500           Purchase             $8.31
     09/09/03           42,700           Purchase             $8.37
     09/10/03            5,000           Purchase             $8.41
     09/10/03            9,278           Purchase             $8.41
     09/11/03           35,000             Sale               $8.84
     09/12/03           20,000           Purchase             $8.99
     09/12/03            5,000             Sale               $9.10
     09/17/03            5,000             Sale               $9.21
     09/17/03           15,000             Sale               $9.12
     09/17/03           45,000             Sale               $9.06
     09/18/03           20,000             Sale               $9.19
     09/18/03           25,000             Sale               $9.16
     09/19/03            5,000             Sale               $9.08
     09/19/03            5,000             Sale               $9.16


                                      -22-

     DATE OF          AMOUNT OF
   TRANSACTION        SECURITIES     TRANSACTION TYPE   PRICE PER SHARE
   -----------        ----------     ----------------   ---------------
     09/23/03           17,000             Sale               $9.13
     09/24/03           70,000             Sale               $9.25
     09/25/03            7,500           Purchase             $8.55
     09/25/03            7,500           Purchase             $8.55
     09/25/03            4,014           Purchase             $8.54
     09/26/03            6,500           Purchase             $8.28
     09/26/03           78,500           Purchase             $8.30
     09/26/03           40,200           Purchase             $8.34
     09/26/03            5,000           Purchase             $8.28
     09/29/03           45,000             Sale               $8.52
     09/30/03            5,000             Sale               $8.47
     10/02/03           25,000             Sale               $8.74
     10/03/03          304,000           Purchase             $9.05
     10/03/03           10,000             Sale               $9.20
     10/03/03           12,100           Purchase             $9.09
     10/03/03            3,500           Purchase             $9.07
     10/03/03            3,500             Sale              $12.08
     10/03/03           20,000             Sale               $9.08
     10/06/03          140,000           Purchase             $9.45

                     ADDITIONAL INFORMATION CONCERNING MESA

      Mesa is subject to the informational requirements of the Exchange Act, and
in accordance with the Exchange Act, files reports and other documents with the
SEC relating to its business, financial condition and other matters. These
reports and other documents should be available for inspection at the public
reference facilities of the SEC at 450 Fifth Street, N.W., Washington, DC 20549.
Copies of Mesa's filings with the SEC should be obtainable, by mail, upon
payment of the SEC's customary charges, by writing to the SEC's principal office
at 450 Fifth Street, N.W., Washington, DC 20549. The SEC also maintains an
Internet website at http://www.sec.gov that should contain electronic copies of
Mesa's filings with the SEC.

      Certain information about the employees and representatives of Mesa who
may assist Mesa in soliciting consents is set forth in the attached Annex II.
Annex III sets forth certain information relating to the ownership of Atlantic
Coast common stock by certain of Mesa's employees and representatives, and about
any transactions between any of them and Atlantic Coast.

                INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

      Our disclosure in this Consent Statement contains some forward-looking
statements. Forward-looking statements give our current expectations or
forecasts of future events. You can identify these statements by the fact that
they do not relate strictly to historical or current facts. They use words such
as "anticipate," "estimate," "expect," "intend," "believe," and other words and
terms of similar meaning in connection with any discussion of future operating
or financial performance.

      Any and all of our forward-looking statements in this Consent Statement
can be affected by inaccurate assumptions we might make or by known or unknown
risks and uncertainties. Consequently, no forward-looking statement can be
guaranteed. Because these statements are subject to risks and uncertainties,
actual results may differ materially from those expected or implied by the
forward-looking statements. We caution you not to place undue reliance on the
statements, which speak only as of the date of this Consent Statement.

      From time to time, we also may provide oral or written forward-looking
statements in other materials we release to the public.

                                      -23-


      We undertake no obligation to publicly update any forward-looking
statements, whether as a result of new information, future events or otherwise.
You are advised, however, to consult any further disclosures we make on related
subjects in our reports to the SEC in, among other places, "Management's
Discussion and Analysis of Financial Condition and Results of Operations" in our
periodic reports filed with the SEC.

      The cautionary statements contained or referred to in this section should
be considered in connection with any subsequent written or oral forward-looking
statements that Mesa or persons acting on its behalf may issue. Mesa undertakes
no obligation to review or confirm analysts' expectations or estimates or to
release publicly any revisions to any forward-looking statements to reflect
events or circumstances after the date of this document or to reflect the
occurrence of unanticipated events.

                                  SOLICITATION

      Solicitation of consents may be made by the directors, officers, investor
relations personnel and other employees of Mesa, its subsidiaries and their
affiliates and by the nominees. Consents will be solicited by mail,
advertisement, telephone or telecopier and in person. No such persons will
receive additional compensation for such solicitation.

      In addition, Mesa has retained MacKenzie to assist in the solicitation,
for which services MacKenzie will be paid customary fees. MacKenzie will be
reimbursed for its reasonable out-of-pocket expenses. Mesa has also agreed to
indemnify MacKenzie against certain liabilities and expenses, including certain
liabilities and expenses under the federal securities laws. It is anticipated
that 45 persons will be employed by MacKenzie to solicit stockholders.

      Banks, brokers, custodians, nominees and fiduciaries will be requested to
forward solicitation material to the beneficial owners of shares of Atlantic
Coast common stock. Mesa will reimburse banks, brokers, custodians, nominees and
fiduciaries for their reasonable expenses for sending solicitation material to
the beneficial owners.

      Merrill Lynch & Co. ("Merrill Lynch") is acting as financial advisor for
Mesa in connection with the proposed acquisition of Atlantic Coast. In
connection with its engagement, Mesa has agreed to pay Merrill Lynch customary
fees for its services. Mesa has also agreed to reimburse Merrill Lynch for its
reasonable expenses, including the reasonable fees and expenses of its legal
counsel, resulting from or arising out of their engagements, and to indemnify
Merrill Lynch and certain related persons against certain liabilities and
expenses, including liabilities and expenses under the federal securities laws
arising out of their respective engagements. In addition, Merrill Lynch has, in
the past, provided financial services to Mesa, for which services it has
received customary compensation.

      Certain employees of Merrill Lynch may also assist Mesa in the
solicitation of proxies, including by communicating in person, by telephone or
otherwise, with a limited number of institutions, brokers or other persons who
are stockholders of Atlantic Coast. Merrill Lynch does not believe that any of
its directors, officers, employees or affiliates are a "participant" as defined
in Schedule 14A promulgated under the Securities Exchange Act of 1934 by the
SEC, or that Schedule 14A requires the disclosure of certain information
concerning Merrill Lynch. Merrill Lynch will not receive any additional fee for
or in connection with such solicitation activities by its representatives apart
from the fees it is otherwise entitled to receive as described above.

      Certain information about the directors and executive officers of Mesa who
are not nominees and certain representatives of Mesa who will assist MacKenzie
in soliciting consents is contained in Annex II. Annex III sets forth certain
information relating to the ownership of shares of Atlantic Coast common stock
by Mesa's directors, officers, employees and representatives who may participate
in the solicitation, and about any transactions between any of them and Atlantic
Coast.

      The cost of the solicitation of consents to the proposals will be borne by
Mesa. Mesa may seek reimbursement of the costs of this solicitation from
Atlantic Coast. If such reimbursement is sought, the question of whether such
reimbursement will be made may be submitted to Atlantic Coast's stockholders.
Costs related to the solicitation of consents to the proposals include
expenditures for attorneys, accountants, financial advisors, consent solicitors,
public relations advisors, printing, advertising, postage, litigation and
related expenses and filing fees and


                                      -24-


are expected to aggregate approximately $[ ] million, of which $[ ] million has
been spent to date. The portion of such costs allocable solely to the
solicitation of consents to the proposals is not readily determinable.

                                CONSENT PROCEDURE

      Section 228 of the DGCL provides that, absent a contrary provision in
Atlantic Coast's certificate of incorporation, any action that may be taken at a
meeting of the stockholders may be taken by the written consent of at least the
minimum number of votes that would be necessary to take such action at a meeting
in which all shares entitled to vote were present and voting. Atlantic Coast's
certificate of incorporation contains no contrary provision.

      The proposals will become effective upon delivery to Atlantic Coast of
signed, dated and unrevoked consents consenting to such proposals, of a majority
of the shares of Atlantic Coast common stock then outstanding. Consents may be
executed by the holders of record of common stock as of the record date, or by
their duly authorized proxy. Section 228(c) of the DGCL provides that no written
consent will be effective unless delivered to Atlantic Coast within 60 days of
the date of the earliest dated consent delivered to Atlantic Coast in the manner
provided by Delaware law. On October 23, 2003, Atlantic Coast announced that it
had set a record date and received a written consent thereby starting the 60-day
solicitation period, which actions are being challenged as being improper in the
Delaware Lawsuit filed by Mesa on October 29, 2003. The deadline for submitting
consents will not be determined until the Delaware Lawsuit has been resolved. We
intend to notify you by press release as promptly as possible of the actual
deadline for submitting consents. However, because the proposals will become
effective upon our delivery to Atlantic Coast of valid and unrevoked consent
cards totaling more than 50% of the outstanding shares of common stock as of the
record date, and because this may occur before the expiration of the 60-day
period, WE URGE YOU TO ACT PROMPTLY to assure that your vote will count. Both
proposals 1 and 2 must be approved by the holders of record, as of the close of
business on the record date, of a majority of the shares of Atlantic Coast
common stock then outstanding for either proposal to be effective.

      Any failure to execute and return a consent, and all abstentions and
broker non-votes, will have the same effect as voting against the proposals.

                    EFFECTIVENESS AND REVOCATION OF CONSENTS

       An executed consent card may be revoked by signing, dating and delivering
a written revocation at any time prior to the date that Atlantic Coast has
received the required number of properly completed, unrevoked consents to
authorize the proposed actions. The delivery of a subsequently dated consent
card that is properly completed and signed will constitute a revocation of any
earlier consent card delivered by such holder. The revocation may be delivered
either to Mesa, in care of MacKenzie, or to an address provided by Atlantic
Coast. Although a revocation is effective if delivered to Atlantic Coast, Mesa
requests that either the original or photostatic copies of all revocations of
consents be mailed or delivered to Mesa in care of MacKenzie at the address set
forth above, so that Mesa will be aware of all revocations and can more
accurately determine if and when unrevoked consents to the actions described in
this Consent Statement have been received from the holders of record of a
majority of outstanding shares of Atlantic Coast common stock.

                              SPECIAL INSTRUCTIONS

      If you were a record holder of shares of Atlantic Coast common stock as of
the close of business on the record date, you may elect to consent to, withhold
consent to or abstain with respect to each proposal by marking the "CONSENT,"
"DOES NOT CONSENT" or "ABSTAIN" box, as applicable, underneath each such
proposal on the accompanying WHITE consent card and signing, dating and
returning it promptly in the enclosed postage-paid envelope or by mailing the
consent card to MacKenzie at the address stated below.

      If the stockholder signing, dating and returning the WHITE consent card
has failed to check a box marked "CONSENT," "DOES NOT CONSENT" or "ABSTAIN" for
any of the proposals, such stockholder will be deemed to have consented to each
such proposal, except that such stockholder will not be deemed to have consented
to the removal of any current Atlantic Coast director or to the election of any
nominee whose name is written in on the consent card under the corresponding
proposal.


                                      -25-


                       MESA RECOMMENDS THAT YOU CONSENT TO
                             EACH OF THE PROPOSALS.

    YOUR CONSENT IS IMPORTANT. PLEASE MARK, SIGN AND DATE THE ENCLOSED WHITE
  CONSENT CARD AND RETURN IT IN THE ENCLOSED POSTAGE-PAID ENVELOPE PROMPTLY OR
           MAIL THE CARD TO MACKENZIE AT THE ADDRESS STATED BELOW.

              FAILURE TO RETURN YOUR CONSENT CARD WILL HAVE THE
                 SAME EFFECT AS VOTING AGAINST THE PROPOSALS.

      If your shares of Atlantic Coast common stock are held in "Street-Name,"
only your bank or broker can execute a consent on your behalf, but only upon
receipt of your specific instructions. To ensure that your consent is effective,
please contact the persons responsible for your account and instruct them to
execute a WHITE consent card on your behalf. Mesa urges you to confirm in
writing your instructions to the person responsible for your account and provide
a copy of those instructions to Mesa in care of MacKenzie at the address set
forth below so that Mesa will be aware of all instructions given and can attempt
to ensure that such instructions are followed.

                                APPRAISAL RIGHTS

      Holders of Atlantic Coast common stock do not have dissenters' appraisal
rights under Delaware law in connection with this Consent Statement or the
proposals contained herein.

      If you have any questions or require any assistance in executing or
delivering your consent, please write to, or call:

                            MacKenzie Partners, Inc.
                               105 Madison Avenue
                            New York, New York 10016
                                 (212) 929-5500
                         Call Toll-Free: (800) 322-2885

Dated:  [   ], 2003


                                      -26-


                                                                         ANNEX I

        INFORMATION CONCERNING ATLANTIC COAST'S OFFICERS AND DIRECTORS

      The following table sets forth certain information, as of October 15,
2003, based on information derived from Atlantic Coast's publicly filed reports
with the SEC as of November 3, 2003, concerning beneficial ownership of Atlantic
Coast's common stock by (i) each director of Atlantic Coast; (ii) each executive
officer of Atlantic Coast named in the preliminary proxy statement filed with
the SEC by Atlantic Coast on November 3, 2003; and (iii) all directors and
executive officers of Atlantic Coast as a group.



                                              AMOUNT AND NATURE OF
                                             BENEFICIAL OWNERSHIP(1)    PERCENT OF CLASS
                    NAME                             SHARES                  PERCENT
------------------------------------------   -----------------------    ----------------
                                                                       
Kerry B. Skeen............................          702,346                    1.5%
Thomas J. Moore...........................          612,902                    1.4%
C. Edward Acker...........................          564,400                    1.2%
Robert E. Buchanan........................           75,800                    *
Susan MacGregor Coughlin..................           53,660                    *
Caroline (Maury) Devine...................           12,500                    *
Daniel L. McGinnis........................           24,000                    *
James C. Miller III.......................           80,000                    *
William Anthony (Tony) Rice...............              -0-                    0%
Richard J. Surratt........................          193,453                    *
William Brown.............................              -0-                    0%
Eric I. Nordling..........................           78,544                    *
Richard J. Kennedy........................           92,797                    *
David W. Asai.............................           86,864                    *
All directors and executive officers as
  a group (14 persons)....................        2,577,266                    5.5%


------------

* Less than one percent.

(1)   Includes options and restricted stock that are exercisable on or within 60
      days after October 15, 2003, as follows: Mr. Skeen, 588,253 shares; Mr.
      Moore, 514,473 shares; Mr. Acker, 24,000 shares; Mr. Buchanan, 52,000
      shares; Mrs. Coughlin, 52,000 shares; Ms. Devine, 12,000 shares; Mr.
      McGinnis, 24,000 shares; Mr. Miller, 52,000 shares; Mr. Surratt, 184,760
      shares; Mr. Nordling, 77,820 shares; Mr. Kennedy, 70,000 shares; Mr. Asai,
      78,160 shares; and all directors and executive officers as a group,
      1,729,466 shares.


                                      I-1

                                                                        ANNEX II

                        INFORMATION CONCERNING DIRECTORS,
                          OFFICERS, EMPLOYEES AND OTHER
                             REPRESENTATIVES OF MESA

      The following table sets forth the name and the present principal
occupation or employment, and the name and principal business address of any
corporation or other organization in which such employment is carried on, of the
directors, officers, employees and representatives of Mesa who may assist in
soliciting consents from Atlantic Coast's stockholders. Unless otherwise
indicated, each person listed below is employed by Mesa and the principal
business address of each person listed below is 410 North 44th Street, Suite
700, Phoenix, Arizona 85008.

                                             PRESENT PRINCIPAL OCCUPATION OR
    NAME AND PRINCIPAL BUSINESS ADDRESS                 EMPLOYMENT
-----------------------------------------    -------------------------------
Jonathan G. Ornstein                           Chairman and Chief Executive
                                                         Officer
Michael J. Lotz                               President and Chief Operating
                                                         Officer
George Murnane III                          Executive Vice President and Chief
                                                    Financial Officer

Jim Ratigan                                   Managing Director, Mergers &
Merrill Lynch & Co.                         Acquisitions, Merrill Lynch & Co.
4 World Financial Center, North Tower
New York, NY 10080

George Ackert                                  Director, Global Industries
Merrill Lynch & Co.                      Investment Banking, Merrill Lynch & Co.
4 World Financial Center, North Tower
New York, NY 10080

Merrill Lynch does not believe that any of its directors, officers, employees or
affiliates are a "participant" as defined in Schedule 14A promulgated under the
Securities Exchange Act of 1934 by the SEC, or that Schedule 14A requires the
disclosure of certain information concerning Merrill Lynch.


                                      II-1


                                                                       ANNEX III

                              CERTAIN TRANSACTIONS
   AMONG MESA, ITS DIRECTORS, EMPLOYEES AND OTHER REPRESENTATIVES AND ATLANTIC
                                      COAST

      Except as disclosed in this Consent Statement, none of Mesa, its directors
or executive officers or the employees or other representatives of Mesa named in
Annex II owns any securities of Atlantic Coast or any parent or subsidiary of
Atlantic Coast, beneficially or of record nor is a party to any contract,
arrangement or understanding with any person for such securities.

      Merrill Lynch, which is acting as financial advisor for Mesa in connection
with the proposed acquisition of Atlantic Coast, engages in a full range of
investment banking, securities trading, market-making and brokerage services for
institutional and individual clients. In the normal course of its business,
Merrill Lynch may trade securities of Atlantic Coast for its own account and the
accounts of its customers and, accordingly, may at any time hold a long or short
position in such securities.

      None of Mesa, its subsidiaries, their directors or executive officers, or
the employees or other representatives of Mesa named in Annex II, or, to their
best knowledge, their Associates has any arrangement or understanding with any
person as (1) to any future employment by Atlantic Coast or its affiliates or
(2) to future transactions to which Atlantic Coast or any of its affiliates will
or may be a party, nor any material interest, direct or indirect, in any
transaction that has occurred within the last two years in which Atlantic Coast
or any of its affiliates was or is a party and in which the amount involved
exceeds $60,000. Certain directors and executive officers of Mesa and/or its
respective associates may also be directors or officers of other companies and
organizations that have engaged in transactions with Atlantic Coast or its
subsidiaries in the ordinary course of business within the last two years, but
Mesa believes that the interest of such persons in such transactions is not
material.


                                      III-1


                                   APPENDIX 1

[WHITE CONSENT CARD]                                      [FORM OF CONSENT CARD]

                    PRELIMINARY COPY -- SUBJECT TO COMPLETION
                 SOLICITATION ON BEHALF OF MESA AIR GROUP, INC.

Unless otherwise indicated below, the undersigned, a stockholder of record of
Atlantic Coast Airlines Holdings, Inc. ("Atlantic Coast") as of the close of
business on [ ], 2003 hereby consents, pursuant to Section 228 of the Delaware
General Corporation Law and Section 2.10 of the Atlantic Coast by-laws for all
shares of common stock of Atlantic Coast held by the undersigned, to the taking
of the following actions without a meeting of the stockholders of Atlantic
Coast:



                (CONTINUED AND TO BE SIGNED ON REVERSE SIDE.)



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                            --FOLD AND DETACH HERE--


                                  Appendix 1-1



                                                      DOES NOT
                                      CONSENT          CONSENT          ABSTAIN

1. Remove Kerry B. Skeen, Thomas
   J. Moore, C. Edward Acker,
   Robert E. Buchanan, Susan
   MacGregor Coughlin, Caroline
   Devine, Daniel L. McGinnis,
   James C. Miller III, and
   William Anthony Rice and any
   director elected or appointed
   to the Atlantic Coast board          [ ]              [ ]              [ ]
   pursuant to a vacancy caused
   by the removal or resignation
   of any of the directors from
   the Atlantic Coast board or
   any newly-created
   directorships prior to the
   effective time of this
   stockholder action.

INSTRUCTION: TO CONSENT, NOT CONSENT OR ABSTAIN FROM CONSENTING TO THE REMOVAL
OF ALL THE PERSONS NAMED IN PROPOSAL #1, CHECK THE APPROPRIATE BOX ABOVE. IF YOU
WISH TO CONSENT TO THE REMOVAL OF CERTAIN OF THE PERSONS NAMED IN PROPOSAL #1,
BUT NOT ALL OF THEM, CHECK THE "CONSENT" BOX ABOVE AND WRITE THE NAME OF EACH
SUCH PERSON YOU DO NOT WISH REMOVED IN THE SPACE PROVIDED BELOW:

------------------------------------------------------------------------------

2. Elect Nathaniel A. Davis,            [ ]              [ ]              [ ]
   Andre V. Duggin, Theodore F.
   Kahan, James R. Link, David T.
   McLaughlin, Peter F. Nostrand,
   and Archille R. Paquette to
   serve as directors of Atlantic
   Coast (or, if any such nominee
   is unable to serve as a
   director of Atlantic Coast due
   to death, disability or
   otherwise, any other person
   designated as a nominee by the
   remaining nominee or
   nominees).

INSTRUCTION: TO CONSENT, NOT CONSENT OR ABSTAIN FROM CONSENTING TO THE ELECTION
OF ALL THE PERSONS NAMED IN PROPOSAL #2, CHECK THE APPROPRIATE BOX ABOVE. IF YOU
WISH TO CONSENT TO THE ELECTION OF CERTAIN OF THE PERSONS NAMED IN PROPOSAL #2,
BUT NOT ALL OF THEM, CHECK THE "CONSENT" BOX ABOVE AND WRITE THE NAME OF EACH
SUCH PERSON YOU DO NOT WISH ELECTED IN THE SPACE PROVIDED BELOW.
------------------------------------------------------------------------------

3. Repeal each provision of the         [ ]              [ ]              [ ]
   Atlantic Coast by-laws adopted
   after August 14, 1998 and
   prior to the effective time of
   the stockholder action
   contemplated hereby.

------------------------------------------------------------------------------


                                 Appendix 1-2




                             THIS PROXY IS REVOCABLE AND WILL BE VOTED AS
                             DIRECTED. IF NO BOX IS MARKED FOR ANY PROPOSAL, THE
                             UNDERSIGNED WILL BE DEEMED TO CONSENT TO SUCH
                             PROPOSAL, EXCEPT THAT THE UNDERSIGNED WILL NOT BE
                             DEEMED TO CONSENT TO THE REMOVAL OF ANY CURRENT
                             DIRECTOR OR TO THE ELECTION OF ANY NOMINEE WHOSE
                             NAME IS WRITTEN-IN IN THE SPACE PROVIDED.

                             IN ORDER FOR YOUR CONSENT TO BE VALID, IT MUST BE
                             DATED. PLEASE MARK, SIGN, DATE AND MAIL YOUR
                             CONSENT PROMPTLY IN THE ENCLOSED POSTAGE-PAID
                             ENVELOPE. The provisions of the Consent Statement
                             dated [ ], 2003 of Mesa Air Group, Inc., are
                             incorporated by reference. IN THE ABSENCE OF
                             DISSENT OR ABSTENTION BEING INDICATED ABOVE, THE
                             UNDERSIGNED HEREBY CONSENTS TO EACH ACTION LISTED
                             ABOVE.

                             Both proposals 1 and 2 must be approved by the
                             holders of record, as of the close of business on
                             the record date, of a majority of the shares of
                             Atlantic Coast common stock then outstanding for
                             either of them to be effective. Proposals 1 and 2
                             may be adopted and become effective independent of
                             proposal 3 and proposal 3 may be adopted and become
                             effective independent of proposals 1 and 2.


Signature(s)_______________________________  Dated______________, 2003

      Please sign exactly as the name appears on the stock certificate or on the
attached label. If shares are held by joint tenants, both should sign. In case
of joint owners, each joint owner must sign. When signing as attorney, executor,
administrator, trustee, guardian, corporate officer, etc., please give full
title.


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                            * FOLD AND DETACH HERE *


                                  Appendix 1-3