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North American Aviation XB-70A on the ramp at Edwards Air Force Base, the figure standing on the ramp provides a relative size comparison with the XB-70A aircraft. Six large nozzles for the General Electric engines are shown between and below the two large vertical tails.

The XB-70A, capable of flying three times the speed of sound, was the world's largest experimental aircraft in the 1960s. Two XB-70A aircraft were built. The number one XB-70A was flown by the NASA Flight Research Center (now NASA Dryden), Edwards, California, in a high speed flight research program. The second aircraft was lost in a mid-air collision on June 8, 1966 with a NASA F-104.