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

Nation: United States

Max Speed: 2,883 mph

Height: 7 ft

Interesting Fact: At the time it set a record for being the fastest air-breathing aircraft.

The X-7 was a busy aircraft. From 1951-1960 the steel constructed jet experienced 130 flights, and was designed by Kelly Johnson who would create the SR-71. It would be carried aloft by either a B-29 or a B-50 Superfortress.