Alaska Airlines flights were back late Sunday night after an IT outage forced the company to ground all flights for three hours. From 8 p.m. until 11 p.m. PST, Alaska Airlines planes were on hold. The airline did not reveal the nature of the outage.

Alaska Airlines grounded all flights late Sunday due to a sudden IT outage affecting operations across its network. The ground stop—impacting both

On Sunday night, Alaska Airlines and its subsidiary Horizon Air were forced to ground all flights due to a computer problem. At 11 p.m. EST, the airline requested a systemwide ground stop from federal aviation authorities.