U.S. Airways CEO Doug Parker, right, and American Airlines CEO Tom Horton pose after a news conference at DFW International Airport Thursday, Feb. 14, 2013, in Grapevine, Texas. The two

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U.S. Airways CEO Doug Parker, right, and American Airlines CEO Tom Horton pose after 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) less