Dallas: Alaska Airlines and its Horizon Air affiliate cancelled 140 flights on Saturday because a computer system used for flight planning failed.
The presidents of both airlines said in a joint video on YouTube that the system used for flight planning failed, causing the cancellations.
During the two-minute statement released late in the afternoon, they said the outage has resulted in the two airlines scrapping about 15 percent of their combined schedule. About 11,700 passengers have been affected.
"A transformer blew and that took down the central computer system for both Alaska and Horizon," Alaska president Brad Tilden said.
The officials said the airlines were working to get the operations back to normal.
Company spokesman Paul McElroy said earlier many other flights were delayed, and customers had trouble getting flight-status updates on the airlines` website because of the outage.
Both Tilden and Horizon president Glen Johnson apologised for the disruption. Johnson said stranded passengers would be rebooked on later planes or put on other airlines. The company said will not be charged a flight-change fee.
Alaska Airlines uses versions of the Boeing 737 with roughly 124 to 172 seats, according to airline seating chart websites. Horizon uses smaller turboprop planes.
Seattle-based Alaska Airlines flies to cities in the US, focusing on the West Coast, and to Canada and Mexico. Alaska and Horizon are owned by Alaska Air Group Inc.