Alaska Airlines and Horizon Air grounded all flights Sunday night due to a computer system outage. The FAA-mandated ground stop lasted until 2 a.m. ET Monday. While the issue is resolved, residual delays are expected throughout Monday. Passengers are advised to check flight statuses before heading to the airport. The outage comes nearly a year after a similar widespread system failure impacting various sectors.

Prepared by Christopher Adams and reviewed by editorial team.