National Security Journal on MSN

The X-15 Hit Mach 6.7 and Put Every Military on Earth On Notice

In 1967, USAF Major “Pete” Knight set a world speed record that remains “unbroken” 68 years later. -Flying the X-15A-2 rocket ...
National Security Journal on MSN

The Mach 6.7 X-15 ‘Hypersonic Rocket Plane’ Has a Message for the U.S. Air Force

The X-15 was a rocket-powered research aircraft that pushed human flight to the edge of space and deep into the hypersonic ...
The National Interest

The X-15 was a Starfighter in All But Name

The X-15 was a key bridge between conventional atmospheric flight and spaceflight. The North American X-15 is one of the most groundbreaking aircraft ever created in the history of aviation and space ...
insider.si.edu

X-15 : the world's fastest rocket plane and the pilots who ushered in the space age / John Anderson, Richard Passman

"The X-15, which flew from 1959-1970, is still the most advanced research aircraft ever developed and flown, and hangs in a place of honor in the Smithsonian's Air and Space Museum. Its test pilots ...