XB-70: World’s Largest Experimental Aircraft in the 1960s.

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The figure standing on the ramp provides a 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, Edwards, CA, in a high-speed flight research program. The second aircraft was lost in a mid-air collision with a NASA F-104 on June 8, 1966.1968NASA Photo › XB-70 Project Description