Alaska Airlines has resumed operations after the failure of a critical piece of hardware forced the airline to ground all its flights for approximately three hours, but the effects will linger into Monday, the company announced.

The carrier issued a system-wide ground stop for Alaska Airlines and Horizon Air flights around 8 p.m. Pacific time Sunday. The stop was lifted at 11 p.m., the Seattle-based company said in a social media post. More than 150 flights have been canceled since Sunday evening, including 64 Monday.

The airline said “a critical piece of multi-redundant hardware at our data centers, manufactured by a third-party, experienced an........

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