GMT, which is 6:30 p.m. Arizona time, according to the FAA. Departures from Seattle-Tacoma International Airport were exempt from the ground stop, the FAA said. The airline also briefly grounded all of its flights in July for about three hours due to an IT outage.

Alaska Air Group’s profits dropped in the third quarter this year as the airline navigated an IT outage that briefly took down its network, and a summer of thunderstorms on the East Coast.