The North American XB-70 Valkyrie was one of the most ambitious aircraft ever built — a futuristic, six-engine supersonic bomber designed to fly higher and faster than anything on Earth. Conceived during the Cold War, the Valkyrie was meant to outrun Soviet interceptors and missiles, cruising at Mach 3 (over 2,000 mph) at 70,000 feet while carrying nuclear payloads deep into enemy territory. With its sleek delta wing, twin vertical tails, and canard foreplanes, the XB-70 looked more like a space