At what airline's largest hub will the Cotton Belt Rail Line have a major terminal? 
Cotton Belt Rail Line: The Cotton Belt Rail Line is a planned 67.7 mi group of commuter rail lines in Tarrant, Dallas, Collin, and Rockwall Counties in the U.S. state of Texas. Dallas/Fort Worth International Airport:  It is the largest hub for American Airlines, which is headquartered near the airport.
i don't know