“We sincerely apologize to our guests whose travel plans have been disrupted. We’re working to get them to their destinations as quickly as we can,” Alaska said in a statement, adding that it has a flexible travel policy in place as it works to “return to normal.” Travelers can check their flight status at alaskaair.com/flightstatus.

The issue began around 3:30 p.m. Thursday when a “failure occurred at our primary data center,” Alaska Airlines said in a statement. Flights were grounded until 11:30 p.m. Thursday.

The flight cancellations impacted Alaska Airlines and its subsidiary regional airline Horizon Air. The IT outage did not affect Hawaiian Airlines, which Alaska acquired last year and is in the process of merging into its system.

The outage was not a cybersecurity incident, the a

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