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FILE - In this Feb. 7, 2013 file photo, a US Airways jet taxis past an American Airlines jet parked at the gate at Sky Harbor International Airport in Phoenix. The merger of US Airways and American Airlines has given birth to a mega airline with more passengers than any other in the world. (AP Photo/The Arizona Republic,Tom Tinkle, File) MARICOPA COUNTY OUT; MAGS OUT;

Associated Press
FILE - In this Feb. 7, 2013 file photo, a US Airways jet taxis past an American Airlines jet parked at the gate at Sky Harbor International Airport in Phoenix. The merger of US Airways and American Airlines has given birth to a mega airline with more passengers than any other in the world. (AP Photo/The Arizona Republic,Tom Tinkle, File)  MARICOPA COUNTY OUT; MAGS OUT;
FILE - In this Feb. 7, 2013 file photo, a US Airways jet taxis past an American Airlines jet parked at the gate at Sky Harbor International Airport in Phoenix. The merger of US Airways and American Airlines has given birth to a mega airline with more passengers than any other in the world. (AP Photo/The Arizona Republic,Tom Tinkle, File) MARICOPA COUNTY OUT; MAGS OUT;
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