United Airlines

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** FILE ** United Airlines planes taxing at San Francisco International Airport in San Francisco, Feb. 23, 2013. (AP Photo/Eric Risberg, File)

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** FILE ** A United Airlines Boeing 787 Dreamliner is parked at Narita Airport outside Tokyo on Thursday, Jan. 17, 2013. (AP Photo/Kyodo News)

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** FILE ** A United Airlines jet departing in view of the air traffic control tower at Seattle-Tacoma International Airport in Seattle, April 23, 2013.

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** FILE ** Air travelers check their luggage at a United Airlines baggage claim area at O'Hare International Airport in Chicago on Thursday, Dec. 22, 2011. (AP Photo/Nam Y. Huh)

Steve Reininger removes a sign with the old United Airlines logo to reveal the new logo featuring the Continental Airlines blue globe at a ticket counter at O'Hare International Airport on May 17, 2011. (Associated Press)

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**FILE** In this photo from Oct. 5, 2010, an American Airlines jet (right) taxis past United Airlines and United Express jets at O'Hare International Airport in Chicago as the Willis Tower looms in the background. (Associated Press)

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This photo illustraion made available on Aug. 11, 2010 by United Airlines and Continental Airlines shows changes to the visual branding for the new global airline. Shareholders of United's parent company and Continental Airlines are voting on a deal that would create the world's biggest airline. Results of the voting will be announced Friday Sept. 17, 2010. (AP Photo/United Airlines, Continental Airlines, Tammy Bryngelson)

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**FILE**Transportation Security Administration's Behavior Detection Officer Terrence McClain (right) watches United Airlines passengers checking in for the morning flight at Washington's Ronald Reagan Washington National Airport on April 8, 2010. (Associated Press)