SEATTLE (AP) — Alaska Airlines said its operations have resumed Friday after it had to ground its planes for hours because of an information technology outage.

The airline said in a statement that 229 flights were canceled because of the outage and that more flight disruptions were expected as it worked to “reposition aircraft and crews.”

Alaska Airlines said it is working on getting travelers affected by the disruption to their destinations.

It asked that passengers check their flight status before heading to the airport.

The grounding Thursday affected Alaska Air and Horizon Air flights.

Hawaiian Airlines, which was bought by Alaska Air Group last year, said its flights were operating as scheduled.

In July, Alaska grounded all of its flights for about three hours after the failure of a critical piece of hardware at a data center.

There has been a history of computer problems disrupting flights in the industry, though most of the time the disruptions are only temporary.

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The story has been updated to correct the time element of operations resuming to Friday, from Thursday, and the day of the grounding to Thursday, from Wednesday.