Responding to enquiries from two US airlines Gulfstream was studying the possibility of stretching the Gulfstream IV by 5,64 meters by means of plugs ahead of and behind the wing. This would make it possible to seat 24 or 26 passengers in individual seats, with a central aisle, two attendants and two pilots. Known as the GIV-B this could introduce a new air transport concept by operating an all-first class service. The Gulfstream IV-B could match or better the performance of the larger airliners. Because of the fitted freight door, cargo space and payload the aircraft could also be of interest for small package expediters. Due to market problems the further development was put on hold.