FSX/P3D v3,v4 North American T-39 Sabreliner. The North American Sabreliner, later sold as the Rockwell Sabreliner, is an American mid-sized business jet developed by North American Aviation. It was offered to the United States Air Force (USAF) in response to its Utility Trainer Experimental (UTX) program. It was named "Sabreliner" due to the similarity of the wing and tail to North American's F-86 Sabre jet fighter. Military variants, designated T39 Sabreliner, were used by the USAF, United States Navy (USN) and United States Marine Corps (USMC) after the USAF placed an initial order in 1959. The Sabreliner was also developed into a commercial variant. FSX/P3Dv3,v4 native upgrade by A.F. Scrub.