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

Nation: United States

Max Speed: Mach 3.1

Interesting Fact: Its fastest speed and altitude ever recorded was 2,020 mph and 74,000 ft.

The planned B-70 nuclear-armed strategic bomber was developed in the late 1950’s by North American Aviation. This 6-engine vessel was meant to be utilized for research purposes, at supersonic speeds.