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But the XB-70 Valkyrie never went into full-scale production, and now there's only one left in the world, sitting on display at The National Museum of the US Air Force in Dayton, Ohio.
The XB-70 was developed in the 1950s to outrun enemy interceptors and air defenses, but ended up being doomed by the birth of surface-to-air missiles.
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In 1961, President John F. Kennedy scratched the XB-70 as an actual bomber program - but the aircraft continued to fly for research purposes until February 1969.
The XB-70 Valkyrie made its maiden flight in September 1964.
The first XB-70 Valkyrie built, the XB-70A, had handling at speeds greater than Mach 2.5, and only got above Mach 3 once. So a second one was built, the XB-70B, with the wings adjusted just 5 degrees, which helped handling. The XB-70B flew for the first time in July 1965.
Here's a shot of what the XB-70 cockpit looks like at the The National Museum of the US Air Force.
And here's a shot of the cockpit from the electronic equipment compartment.
On June 8, 1966, while conducting high-speed flight research, the XB-70 collided with NASA's F-104N chase plane, killing the F-104 pilot and the XB-70 co-pilot. The other XB-70 pilot was able to eject and survived, albeit with serious injuries.
After the destruction of the XB-70B, only the first XB-70A remained.