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 temporarily grounded on Sunday.

Alaska Airlines (ALK.N) said it has canceled 7% of its flights Monday in the aftermath of a ground stop late Sunday prompted by the unexpected failure of a critical piece of hardware at its data cente...

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