Gulfstream IV

===G350/G450===
[[File:TC-KHB G450 pvt (7950005974).jpg|thumb|The G450 (GIV-X) is {{cvt|12|in|cm}} longer and the main door is moved aft, it has updated engines, flight deck and systems.]]

The '''G450''' is a designation for the model '''GIV-X''', approved by the FAA on August 12, 2004, as is the '''G350''', which has a reduced fuel capacity. Compared to the '''Gulfstream IV''', its fuselage is 12 inches longer and the main entry door relocated aft. The [[Rolls-Royce RB.183 Tay|Rolls-Royce Tay]] 611 engines are replaced by 611-8Cs with FADEC, redesigned thrust reversers, nacelles and pylons which increases range and payload, coupled with  aerodynamic improvements. Many [[Gulfstream V-SP]] improvements are used: the [[Honeywell]] advanced flight deck display suite, electrical power generation, cabin temperature control and pressurization, nose and nose landing gear. It also has an improved APU and flap/stab actuation system, redesigned main landing gear wheels and brakes, flight control system hard-over protection system.<ref name= typeCert>{{cite web |url= http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/2d504046f9657ec386257f610074fcfb/$FILE/A12EA_Rev46.pdf |title= Type Certificate date Sheet NO. A12EA, revision 46 |publisher= FAA |date= February 22, 2016}}</ref>

By the end of the G450 production run, 365 aircraft were produced, with prices ranging from $15 million to $32 million.<ref>{{cite news |url= http://aviationweek.com/business-aviation/operational-look-gulfstreams-g450 |title= An Operational Look at: Gulfstream's G450 |date= November 24, 2014 | first = Fred | last = George |work= Business & Commercial Aviation}}</ref>