The Advanced Tactical Fighter (ATF) was a program undertaken by the United States Air Force to develop a next-generation air superiority fighter to counter emerging worldwide threats, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development in the 1980s, Beriev A-50 airborne warning and control system (AWACS), and increasingly sophisticated surface-to-air missile systems. Lockheed and Northrop were selected in 1986 to respectively develop the YF-22 and the YF-23 technology demonstrator aircraft for the program's demonstration and validation (Dem/Val) phase. These aircraft were evaluated in 1991 and the Lockheed design was selected for full-scale development, or engineering and manufacturing development (EMD), and later developed into the F-22 Raptor for production and operational service.

The Lockheed/Boeing/General Dynamics YF-22 is an American single-seat, twin-engine fighter aircraft technology demonstrator designed for the United States Air Force (USAF). The design was a finalist in the USAF's Advanced Tactical Fighter (ATF) competition, and two prototypes were built for the demonstration/validation phase of the competition. The YF-22 won the contest against the Northrop YF-23 for full-scale development, and the design was developed into the Lockheed Martin F-22 Raptor. The YF-22 has a similar aerodynamic layout and configuration as the F-22, but with notable differences in the overall shaping such as the position and design of the cockpit, tail fins and wings, and in internal structural layout.