A United Airlines computer malfunction halted all departures systemwide for two hours Wednesday, the carrier said.
United spokeswoman Robin Urbanski said the airline did not yet know what caused the outage between 8 a.m. and 10 a.m. CDT, when departures were able to resume.
"We were experiencing a computer outage and now our computers are back up," she said. "Right now we're working hard to resume our operations."
FAA spokesman Allen Kenitzer in Seattle confirmed that all United flights across its system had been grounded because of the computer problem.
At O'Hare International Airport, United's inbound and outbound flights were delayed between one and two hours, and no other airlines were affected, airport spokeswoman Wendy Abrams said.
Michael McCarron, director of community affairs for the San Francisco International Airport, said about a dozen United flights had been affected at the airport Wednesday morning and most delays averaged 20 to 30 minutes. Chicago-based United is the airport's largest carrier.
"I expect it to decrease as the day goes on," he said. "And by noon, (it will) be pretty much back on track."
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