The Advanced Tactical Fighter (ATF) was a program undertaken by the United States Air Force to develop a next-generation air superiority fighter to replace the F-15 Eagle in order to counter emerging worldwide threats in the 1980s, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development, Beriev A-50 airborne warning and control systems (AWACS), and increasingly sophisticated surface-to-air missile systems. The ATF would make a leap in performance and capability by taking advantage of emerging technologies, including advanced avionics and flight control systems, more powerful propulsion systems, and stealth technology. (taken from wiki note this part ahead is fictional), this is the Rockwell design that entered the contest, ultimately being rejected in favor of the F-22, however, they saw potential in it as a LCA and with some modifications, it entered into service in 2005, alongside the F-22
notes
it a rather simple plane, based off of this