Gulfstream IV

==Development==
[[File:Gulfstream Aerospace G-IV-X Gulfstream G450, Falcon Aviation Services AN1445085.jpg|thumb|executive cabin]]

Gulfstream, in collaboration with [[Grumman]], began work on the Gulfstream IV in March 1983 as a re-engined, stretched fuselage derivative of the [[Gulfstream III]]. 
The first GIV made its maiden flight on September 19, 1985.<ref name=Frawley_Civil_GIV/> The model received type certification from the FAA on April 22, 1987.<ref name= typeCert/> The G-IV entered into service with serial number 1000 in 1987 and was upgraded to the special purpose '''GIV-SP''' version at serial number 1214 in 1993.  It was later redesignated '''G400''' at serial number 1500.<ref name="flagship">{{cite news |url= http://aviationweek.com/awin/gulfstream-iv |title= Gulfstream IV
|work= Business and Commercial Aviation |publisher= Aviation Week |date= January 2009}}</ref>
A shorter range variant was created based on the GIV and given the '''G300''' designation in 2002.<ref name=Frawley_Civil_GIV>Frawley, Gerald. "Gulfstream IV, G300 & G400". ''The International Directory of Civil Aircraft, 2003/2004''. Fishwick, Act: Aerospace Publications, 2003. {{ISBN|1-875671-58-7}}.</ref>

In 2001, Gulfstream began work on an improved version of the GIV-SP, originally designated '''GIV-X'''.  It was later renamed '''G450'''.  The G450 is lengthened 1&nbsp;ft (0.305 m) over the G400 and shares the forward fuselage and larger cockpit of the [[Gulfstream G550|G550]].  Following its first flight on 30 April 2003, production of the G450 began in October 2004, replacing the G400.  The G450 has better performance and comes with the PlaneView cockpit with four 14-inch (355&nbsp;mm) [[liquid crystal display]]s and a [[Head up display]] (HUD).  The shorter range '''G350''' version of the G450 was developed and received certification in 2004.<ref>{{cite news |last1=Gerzanics |first1=Michael |title=Flight Test: Gulstream [sic] G450 – Heir Apparent |url=https://www.flightglobal.com/flight-test-gulstream-g450-heir-apparent/57841.article |access-date=15 October 2023 |work=Flight Global |date=22 November 2004}}</ref><ref>{{cite news |last1=Velocci |first1=Tony |title=G450 Production Coming To An End |url=http://www.forbes.com/sites/businessaviation/2016/10/22/g450-production-coming-to-an-end |access-date=15 October 2023 |work=Forbes |date=22 October 2016}}</ref>

By 2018, 1990 to 1992 GIVs were for sale at $1.6-4.4 million, 1992 to 1999 GIVSPs were listed for $1.25-5.2 million, 15-year-old G300s and G400s were available for $4.5-7 million and 2006 to 2016 G450s at $9.95-23.75 million.<ref name=AINdec2018>{{cite magazine |url= https://www.ainonline.com/sites/default/files/full-issues/ain_1218.pdf |title= For many models, market hitting the apex |magazine= Aviation International News | first = Mark | last = Huber |date= December 2018 |pages= 20–21, 24}}</ref>