Manufactured by Lockheed, and under license by Canadair and a consortium of European companies which included Messerschmitt/MBB, Dornier, Fiat, Fokker and SABCA. The type featured strengthened fuselage and wing structure, increased internal fuel capacity, an enlarged vertical fin, strengthened landing gear with larger tires and revised flaps for improved combat maneuvering. Upgraded avionics included a new Autonetics NASARR F15A-41B radar with air-to-air and ground mapping modes, the Litton LN-3 Inertial Navigation System (the first on a production fighter) and an infrared sight.