The Gulfstream III received its approval from the FAA in September 1980. Modifications included the inboard wing that was extended in chord and recontoured to reduce the aircraft's high-speed drag. The wing span was increased by six feet and five-foot winglets were added. In addition, the fuselage was lengthened by an additional two-foot section aft of the main door and the radome was extended and re-contoured. A new curved windscreen was incorproated, changes were made to the cockpit instruments and autopilot and the maximum take-off weight was increased.