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The first prototype, XB-70A-1, rolled out on May 11, 1864, in Palmdale, California, and made its maiden flight on September 21 of that year. A second prototype, XB-70A-2 followed in 1965.

NASA and Boom Supersonic just released an incredible photo capturing a shockwave emanating from the dark silhouette of the supersonic XB-1 aircraft while it traveled in front of the sun during a ...