U.S. Airways CEO Doug Parker, left, and American Airlines CEO Tom Horton laugh during a news conference at DFW International Airport Thursday, Feb. 14, 2013, in Grapevine, Texas. The two airlines will merge forming the world's largest airlines. (AP Photo/LM Otero)

Associated Press
U.S. Airways CEO Doug Parker, left, and American Airlines CEO Tom Horton laugh during a news conference at DFW International Airport Thursday, Feb. 14, 2013, in Grapevine, Texas. The two airlines will merge forming the world's largest airlines.  (AP Photo/LM Otero)
U.S. Airways CEO Doug Parker, left, and American Airlines CEO Tom Horton laugh during a news conference at DFW International Airport Thursday, Feb. 14, 2013, in Grapevine, Texas. The two airlines will merge forming the world's largest airlines. (AP Photo/LM Otero)
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