Alaska Air Group Inc. continued to recover on Monday after temporarily grounding its entire fleet due to a data center equipment failure that affected several of the carrier’s key operating systems.

"At approximately 8 p.m. Pacific on Sunday, Alaska Airlines experienced an IT outage that’s impacting our operations. We requested a temporary, system-wide ground stop for Alaska and Horizon Air flights until the issue is resolved," the airline said in a statement Sunday evening. The airline said it resumed operations at about 11 p.m. PT.