Hundreds of Alaska Airlines flights and thousands of passengers’ travel plans were disrupted over the weekend and well into Monday following a “significant IT outage” that resulted in the grounding of planes for about three hours.

Alaska Airlines has revealed that an "unexpected failure" of a critical piece of hardware caused an IT outage that led to its entire fleet being grounded.

Alaska Air Group resumed flights after a data center hardware failure triggered a major IT outage, grounding its entire fleet for hours. The issue caused over 150 flight cancellations and disrupted operations across Alaska Airlines and Horizon Air.