OAKLAND (CBS / AP) — A system-wide computer problem forced Southwest Airlines to ground its entire fleet of airplanes preparing for late-night departures Friday, including flights from the Bay Area’s three major airports. Cancellations were expected even after service slowly resumed using a backup system, a company spokesman said.

Brad Hawkins told The Associated Press an estimated 250 flights were grounded at least temporarily due to the glitch, which impaired the airline’s ability to do such things as conduct check-in, print boarding passes and monitor the weight of the aircraft.

Some flights were on the taxiway and diverted back to the terminal after the problem was detected around 8 p.m. PT Friday, he said. Flights already in the air were unaffected.

Hawkins said service resumed around 11 p.m. PT Friday after officials began using a different system.

“Backup systems are in place not the main system, so it’s slower,” he said. “But we are able to start launching these flights.”

He said at least some cancellations were expected because the airline doesn’t do redeye flights and was near “the end of our operational day.”

The late hour of the disruption meant the computer problem affected far more flights on the West Coast, but Hawkins said at least a few on the East Coast were grounded as well. Southwest, based in Dallas, conducts, on average, 3,400 flights a day.

A spokesman for Los Angeles International Airport said of about 25 inbound and outbound flights remaining Friday, only five departing flights were experiencing delays, of 30 to 80 minutes. At LA/Ontario International Airport (ONT), a total of three flights — all departures — were affected.

Four Southwest flights were temporarily held in Seattle, said Christina Faine, a Seattle-Tacoma International Airport spokeswoman.

One flight to Oakland had been due to leave at 9:20 p.m. and departed before 11 p.m. Faine said late Friday night that an airport duty manager, Anthony Barnes, told her the others were expected to depart shortly.

Steve Johnson, a spokesman for Portland, Ore., International Airport, said he was not aware of any planes held up there.

(Copyright 2013 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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