Great Planes looks into the stories behind the most influential, innovative and intriguing machines that ever took flight. The North American Aviation XB-70 Valkyrie was the prototype version of the proposed B-70 nuclear-armed deep penetration bomber for the United States Air Force s Strategic Air Command. Designed in the late 1950s, the Valkyrie was a large six-engined aircraft able to fly Mach 3+ at an altitude of 70,000 ft (21,000 m), which would have allowed it to avoid interceptors, the only effective anti-bomber weapon at the time. Engineers had tried to build a supersonic bomber since World War II, and finally completed the XB-70 Valkyrie in 1964. See the story of this amazing plane on this episode of Wings.

A hapless New York advertising executive is mistaken for a government agent by a group of foreign spies, and is pursued across the country while he looks for a way to survive.