Alaska Airlines says it has resumed flights after a nationwide ground stop due to a tech outage, but disruptions continued into Friday.

The Seattle-based carrier, which also operates Horizon Air and Hawaiian Airlines, said in a social media post at 3:24 a.m. ET Friday that operations had been restored "after a significant IT outage resulted in a system-wide ground stop of flights for Alaska and Horizon."

The ground stop was lifted at 11:30 p.m. Thursday night Pacific time, the airline said, adding that it was "working to get our operations back on track as quickly and safely as possible."

From Thursday into Friday afternoon, the airline said more than 400 flights had been canceled on Alaska and Horizon as it repositioned aircraft and crews. It added that there had been no disruptio

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