FILE - In this Thursday, Feb. 14, 2013, file photo, American Airlines and US Airways jets prepare for flight at a gate at the Philadelphia International Airport in Philadelphia. Europea

 

              FILE - In this Thursday, Feb. 14, 2013, file photo, American Airlines and US Airways jets prepare for flight at a gate at the Philadelphia International Airport in Philadelphia. Europea
FILE - In this Thursday, Feb. 14, 2013, file photo, American Airlines and US Airways jets prepare for flight at a gate at the Philadelphia International Airport in Philadelphia. European authorities cleared US Airways Group Inc.'s proposed merger with American Airlines' parent company, AMR Corp., Monday, Aug. 5, 2013, on the condition that they give up one slot at London's Heathrow airport and take steps to foster competition on the London-Philadelphia route. (AP Photo/Matt Rourke, File)