The Gulfstream IV is a significantly improved and larger version of G-II and G-III. It was first delivered in 1987. In 1992 The improved Gulfstream IV-SP replaced the GIV with higher payload range performance. Rolls Royce Tay Mk 611-8C turbofan engines give the aircraft greater fuel efficiency and lower operating costs. The cabin is spacious and provides full comfort for the passengers.