Throngs of travelers were stranded in the United Airlines terminal at O'Hare International Airport on Friday due to an apparent outage of the airline's check-in kiosks.
A United Airlines spokeswoman confirmed an outage was affecting the airline's reservation system, but would not speak to any delays or cancellations.
"UA experiencing computer outage interrupting departures, airport processing and reservations... working to resolve the issue," the airline said in a tweet.
At Los Angeles International Airport, United Airlines operations said there was a "nationwide computer malfunction." Employees were checking in passengers manually, said LAX spokeswoman Nancy Castles.