NEW YORK - Thousands of United Airlines passengers around the globe were stranded at airports and on planes Thursday after another computer outage at the world's largest carrier.
This was at least the third major computer outage for the Chicago-based airline since June.
Around 10 a.m., United tweeted, "We're aware of a computer issue affecting some of our flights. We're working to resolve it. We'll update as we have more details."
At 11 a.m., they tweeted, "Our system is up. We're resuming operations for affected flights."
Passengers were told by pilots and airport agents that computers are down. Some fliers said they had been waiting nearly 2 hours to depart.
Judd Shapiro of Nashua, N.H. said he got to the gate at Logan Airport in Boston and agents told him and other frustrated fliers that planes could land but not take off.
"JetBlue is taking off, American is taking off, but United is on the ground," he said. "I was having a flawless airport experience until I got to the gate."
United has been struggling with technology problems since March, when it switched to a passenger information computer system that was previously used by Continental. United and Continental merged in 2010. That system, called "Shares," has needed extensive reworking since March to make it easier for workers to use.
Michael Silverstein, who works in finance, was supposed to be on a 6:01 a.m. flight from Los Angeles to San Francisco. The computer outage had already caused him to miss one meeting and he was worried about missing another. So he walked off the plane and bought a $195 last-second ticket on a Southwest Airlines flight to Oakland, Calif.
"I'm frustrated because I'm missing a meeting that I thought I had plenty of time for," Silverstein said.
Copyright 2012 by The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.