** 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)

Photo by: Nam Y. Huh

** 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)