FILE - In this July 13, 2011 file photo, United Airlines planes sit on the tarmac at San Francisco International Airport in San Francisco. Thousands of United Airlines passengers around the globe were delayed for hours Thursday, Nov. 15, 2012 after another massive computer outage hit the world’s largest carrier. This is at least the third major computer outage for the Chicago-based airline since June. (AP Photo/Eric Risberg, File)

Associated Press
FILE - In this July 13, 2011 file photo, United Airlines planes sit on the tarmac at San Francisco International Airport in San Francisco. Thousands of United Airlines passengers around the globe were delayed for hours Thursday, Nov. 15, 2012 after another massive computer outage hit the world’s largest carrier. This is at least the third major computer outage for the Chicago-based airline since June. (AP Photo/Eric Risberg, File)
FILE - In this July 13, 2011 file photo, United Airlines planes sit on the tarmac at San Francisco International Airport in San Francisco. Thousands of United Airlines passengers around the globe were delayed for hours Thursday, Nov. 15, 2012 after another massive computer outage hit the world’s largest carrier. This is at least the third major computer outage for the Chicago-based airline since June. (AP Photo/Eric Risberg, File)
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