Northrop and McDonnell Douglas developed the YF-23, while Lockheed, Boeing, and General Dynamics created the YF-22. Although the YF-23 was faster and stealthier, it lacked the agility of the YF-22. After four years of evaluation, the YF-22 was chosen in 1991, resulting in the F-22 Raptor, which first flew in 1997 and entered service in 2005.
