The XB-70 Valkyrie, a Mach 3-capable bomber developed during the Cold War, was designed to outpace Soviet air defenses. Powered by six turbojet engines, it could reach 2,076 mph at 73,000 feet.

A RUSSIAN Tu-22M3 supersonic bomber jet capable of carrying nukes crashed overnight in a fireball explosion. The £228million aircraft was part of Vladimir Putin’s nuclear strike force used ...