The Gulfstream II is an American twin engine business jet built by Gulfstream Aerospace, and its US military designation is C-11 Gulfstream II. It has been succeeded by the C-20 Gulfstream III. A modified version of the C-11, called the Shuttle Training Aircraft (STA), mimics the cockpit configuration and flight characteristics of the Space Shuttle and is used by NASA as a training airplane for practice shuttle approaches (referred to as "dives").

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.There are two types of GIIIs in service. Earlier model GIIIs have a DC based electrical system, these are referred to as Non-VSCF (Variable Speed, Constant Frequency). Alternately newer GIIIs have an AC based electrical system, and are referred to as VSCF GIIIs.