The Federal Aviation Administration on Wednesday issued a nationwide ground stop advisory for all Alaska Airlines aircraft.

The FAA said in a statement that Alaska asked the agency to pause the airline’s mainline departures nationwide as it works to resolve an issue with its weight and balance system "as quickly as possible." 

As a result, a ground stop was issued just before 8 a.m. PT for all Alaska and Horizon flights, the carrier said in a statement. SkyWest flights were excluded from the advisory.

"This morning we experienced an issue while performing an upgrade to the system that calculates our weight and balance," Alaska said in a statement. "We're working to resolve the issue as quickly as possible."

This is a developing story. Check back for updates.