The failure, in the airline’s computer network, forced it to ground flights Sunday night for about three hours. The outage, tied to third-party equipment, yielded about 200 cancelled flights. A replacement is underway.

Alaska Airlines grounded all its flights due to an undisclosed technical error affecting its entire system, the carrier announced early Monday.

“We apologize to our guests for this inconvenience. There will be residual impacts to our operation throughout the evening,” it said in its statement.