At what airline's largest hub will the Cotton Belt Rail Line have a major terminal? 
Cotton Belt Rail Line:  The lines will provide service from Dallas's northeast suburbs to Southwest Fort Worth with a major terminal at the north end of Dallas/Fort Worth International Airport. Dallas/Fort Worth International Airport: Dallas/Fort Worth International Airport (IATA: DFW, ICAO: KDFW, FAA LID: DFW) is the primary international airport serving the Dallas–Fort Worth metroplex area in the U.S. state of Texas.
i don't know