The F-22 Raptor remains America's only operational 5th-generation air superiority fighter, with just 187 built despite an original requirement for 750.
South Korea has launched a formal concept study for a sixth-generation fighter, signaling its ambitions to build on the KF-21 Boramae program with a next-era combat aircraft.
Boeing's F-47 NGAD fighter has been spotted over Nevada with a reported tailless canard design that signals a fundamental shift in American fighter aerodynamics.