Two YF-23 prototypes designed by the contractor team of Northrop and McDonnell Douglas as a part of the demonstration and analysis phase|part of the US Air Force's Advanced Tactical Fighter selection program, that concluded in 1990. consistent with the Air Force, factors in the selection for production of the F-22 were a much better designed for maintainability, larger potential for future development, and slightly lower value. a popular view is that the decision mirrored a preference for maneuverability over stealth, and it's universally held that the YF-23 was by far the better looking aircraft.
During the ATF program, one YF-23 was powered by twin Pratt and Whitney YF119 turbofan engines, while 2 General electrical YF120 turbofan engines were put in different prototype. that includes a diamond-shaped planform, two large, sharply-canted ruddervators, and a serrated aft profile, the high performance aircraft was larger than the F-15 it was designed to exchange. The YF-23 used stealth characteristics and was capable of supersonic cruise flight without afterburner.
