CHICAGO -- Southwest Airlines was operating normally Saturday afternoon after a systemwide computer failure caused it to ground 250 flights for nearly three hours late Friday night.

Full service was restored just after 2 a.m. Eastern Time Saturday, but the Dallas-based airline experienced lingering delays in the morning as it worked to clear a backlog of flights and reposition planes and crew.

The airline -- the country's largest domestic carrier -- canceled 43 flights Friday night and another 14 Saturday morning.

Long Island MacArthur Airport deputy commissioner Terry Hennessey said the Ronkonkoma hub was not affected by Southwest's computer outage.

Southwest is the latest airline to ground flights because of a large computer outage. But its problem was minor compared with those experienced by two competitors -- thanks in part to its late-day timing.

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Most of Southwest's cancellations Friday night were in the western half of the country, according to airline spokeswoman Michelle Agnew. Saturday's cancellations were scattered across the United States. They included planes leaving from Minneapolis, Chicago, Phoenix, Denver and San Diego, according to flight tracking service FlightAware.

Agnew said in an email Saturday morning that the airline's technology team is "still working to confirm the source of the issue." -- AP and Candice Ruud