You Won’t Believe These Planes Never Made It To Production

Douglas X3 Stiletto- 1953

Thank you, U.S. Army for making all the cool craft on this list. This thing looks sweet, like a flying needle. The goal was investigative. They wanted to find out how a plane held up in supersonic speeds. The goal? 2000 MPH. Sadly, it was underpowered. The X3 couldn’t break Mach 1.