<hi style=afpcap>The origins of the T-39 were somewhat unusual as the Air Force issued a specification for its utility trainer experimental (UTX), but required the manufacturers to design and fly a prototype as a private venture. North American already had a similar project under way, and was able to respond with its NA-246 proposal. The prototype was delivered to Edwards AFB late in 1958, with the Air Force completing its evaluation after a three month period. This was followed by a contract for seven T-39As placed in 1959, with additional orders for 150 Sabreliners being placed between 1960 and 1962. Six were delivered as T-39Bs equipped with NASARR all-weather search and range radar as used in the F-105 Thunderchief. These were based at Nellis AFB, Nevada early in their career before being employed as test vehicles with Air Force Systems Command. Air Training Command operated some early production T-39As at Randolph AFB, Texas for training purposes, although the majority were assigned to the VIP and communications role with the major commands and their headquarters. Later in their career there was a change of designation to CT-39A to signify the transportation role. </hi>
