National Air And Space Museum Suspended X15 Rocket Plane Washington DC United States // WASHINGTON DC, United States — Visitors explore the Milestones of Flight Hall at the Smithsonian National Air and Space Museum beneath a suspended North American X-15 rocket plane. Bearing the tail number 66670, this specific aircraft is the X-15-1, a hypersonic research vehicle operated jointly by NASA and the U.S. Air Force to investigate the extreme aerodynamic and thermal conditions of high-altitude flight. The broader X-15 program set world speed and altitude records in the 1960s, reaching Mach 6.7 and

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