Two teams competed: Northrop Grumman with the YF-23 and Lockheed Martin with the YF-22, which would become the F-22 Raptor.

The YF-23 competed in the Advanced Tactical Fighter (ATF) program during the Cold War but lost to Lockheed's YF-22, which became the F-22 Raptor. The YF-23 was admired for its stealth, speed ...

What You Need to Know: The Northrop YF-23, nicknamed “Black Widow II,” was a stealth fighter prototype developed in the late 1980s and early 1990s as part of the U.S.... What You Need to Know ...

Had Northrop won the competition, the F-23 might... Here’s What You Need to Remember: Ultimately, the Air Force ended up with an excellent plane with the Raptor—but both the YF-22 and YF-23 ...