The reason for the grounding, late on Sunday, was not immediately clear. Alaska Air said on its website that it was “experiencing issues with our IT systems.”
Alaska Airlines requested a ground stop for its entire fleet of planes that operate under its brand name and Horizon Air, a subsidiary, the Federal Aviation Administration said in an advisory on Sunday night.
The reason for the advisory, issued late Sunday, was not immediately clear. It initially only affected the over 200 aircraft under the Alaska Airlines brand name but was then expanded to include Horizon Air planes.
“We are experiencing issues with our IT systems. We apologize for the inconvenience and are working to resolve the issues,” Alaska Airlines said in a short statement on its website early Monday.
As of April 24, Alaska Airlines said it operated 238 planes, all Boeings, under its brand, and another 45 planes under the Horizon Air brand.
Alaska Airlines is the fifth largest U.S. airline, according to its website, which flies to more than 120 destinations in five countries and has more than 44 million customers each year.
Neither Alaska Airlines nor the F.A.A responded immediately to requests for comment.