ECN-2128 In this view the #1 XB-70A 62-0001 is in a level cruise flight mode at a relative high altitude judging from the darkness of the sky.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. Ship #1 was flown by the NASA Flight Research Center now NASA Dryden, Edwards, California, in a high speed research program.1968 NASA Photo
