The DFW Airport area is served by International Parkway (partially State Highway 97 Spur), which runs through the center of the airport, connecting to Airport Freeway (State Highway 183) on the southern side of the airport and John W. Carpenter Freeway (State Highway 114) on the northern side. International Parkway continues north of State Highway 114, carrying the State Highway 121 designation for a short while until its interchange with the Lyndon B. Johnson Freeway (I-635), where State Highway 121 continues north as the Sam Rayburn Tollway.