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SQ Wings 1:200 XB-70A Valkyrie NASA/USAF Prototype AV-1

To avoid interception on deep-penetration missions, the aircraft was to be capable of Mach 3+ at an altitude of 70,000 feet. It made its maiden flight on September 21, 1964 and reached Mach 3.02 at 70,000 feet on October 14th, 1965.