The North American XB-70 was supposed to be a game-changing Mach 3 bomber, but the futuristic aircraft was obsolete before it even flew for the first time ...

The North American XB-70 Valkyrie, a Cold War-era bomber, was a technological marvel designed to fly at Mach 3 and at 70,000 feet, circumventing Soviet air defenses through speed and altitude ...

The XB-70 Valkyrie was America’s bet on speed - Mach 3, 70,000 feet high, and built to outrun enemy missiles. It was massive, ...