The Gulfstream III, a business jet produced by Gulfstream Aerospace, is an all-weather, long-range, high speed aircraft powered by two Rolls-Royce Spey turbofan engines with thrust reversers. In 1965 Grumman Aircraft decided that turboprops were a thing of the past. The GII shares the same forward fuselage and cross section as the GI. There are more differences than similarities. The most obvious difference is the two rear mounted Rolls-Royce Spey axial flow turbojet engines. The other differences include a new swept wing and tail. A similar size fuselage to the GI seats 10 in a typical executive configuration. The Gulfstream III is a Gulfstream II with a three and a half foot stretch in the cabin and a new wing. This wing is over eight feet longer and carries 4,961 pounds more fuel increasing range by 921 nautical miles. The first flight was a production standard aircraft, which first flew on October 2, 1966.