🛩️ 1. Lockheed YF-22 (Prototype) Role: Advanced Tactical Fighter (ATF) prototype First flight: 1990 Developed by: Lockheed (with Boeing and General Dynamics) Engine: Pratt & Whitney YF119 or General Electric YF120 (depending on the test airframe) Top speed: ~Mach 2.2 (est.) Key feature: Served as the prototype that won the U.S. Air Force ATF competition over Northrop’s YF-23. Design goal: Combine stealth, agility, and supercruise for air dominance. 🧠 Think of the YF-22 as the “concept car” ver