Fifth Gen Authority — 2 museum-grade prints that set the mood. The F-35 Lightning II program became the most expensive weapons development effort in history while simultaneously delivering the first mass-produced stealth fighter available to allied air forces beyond the United States. The F-35A's sensor fusion architecture — combining radar, electro-optical targeting, and distributed aperture feeds into a single pilot picture — redefined how fourth- and fifth-generation aircraft cooperate in contested airspace. The Chengdu J-20 Mighty Dragon became the world's third operational fifth-generation stealth fighter after the F-22 Raptor and F-35 Lightning II, signalling China's ambition to contest American air superiority in the Indo-Pacific. First flown in 2011 and entering squadron service by 2017, the J-20's large fuselage and canard-delta layout prioritise range and payload over pure kinematic dogfighting — a design philosophy analysts compare to an interceptor-strike hybrid rather than a close-in fighter.