O'Hare International Airport

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President Obama and first lady Michelle Obama wave while boarding Air Force One before leaving O'Hare International Airport in Chicago on Nov. 7, 2012. (Associated Press)

President Obama walks from Marine One to board Air Force One at O'Hare International Airport on Aug. 13, 2012, in Chicago, en route to Offutt Air Force Base in Bellevue, Neb., and onto a three-day campaign bus tour through Iowa. (Associated Press)

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ASSOCIATED PRESS An air traveler is patted down by a TSA agent at O'Hare International Airport in Chicago. Experts say reforms in TSA's airport-screening policies are needed, though they cautioned the agency to be careful not to make the policies too lenient.

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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)

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A genuine Oscar statue awaits its security check at O'Hare International Airport in Chicago before its flight to Los Angeles. (Associated Press)

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An American Airlines plane is parked at the terminal at O'Hare International airport in Chicago on July 20, 2011. (Associated Press)

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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)