Alaska Airlines issued a brief ground stop in Seattle caused by a technology problem Sunday night.
The issue was resolved by about 10 p.m., but an airline spokesperson told Rueters there could be some residual effects.
According to the Associated Press, customers took to social media to complain about delays and problems with Alaska’s app and website.
Alaska said the problem wasn’t the result of a cyberattack or unauthorized activity, but a certificate problem that affected several systems.
“If you are traveling today, please check your flight status before leaving for the airport. If your schedule allows, please change or cancel your flight,” the airline said on its home page. “We apologize for the inconvenience and are working quickly to resolve the issue.”
In April, the airline had to ground flights nationwide because of a technology issue related to a weight and balance system.
And less than a month ago, systems at Seattle-Tacoma International Airport were taken down in a ransomware attack. Screens that directed passengers to their flights and baggage went down, along with other operations.