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Excerpt from Handbook of Instructions for the Structural Repair of the "Texan" Trainer Airplanes: Series: At-6a, at-6b, at-6c, Snj-3 and Snj-4, January 18, 1943Your cooperation in reporting your views on this Manual and the material contained herein will help substantially in the further development of a more adequate manual. Opinions on the matter are soiic ited and may be communicated to the company through the North American Service Represe...

North American Aviation's X-15 rocket plane flew at Mach 6.72 and at altitudes above 67 miles -- at the threshold of space. The men who piloted this amazing plane became the USAF's first astronauts. Powered by an XLR-99 engine capable of producing 70, 000 pounds of thrust at peak altitude, the X-15 pushed the flight envelope for manned aircraft past the post office. Notably, both Apollo astronaut Neil Armstrong and Space Shuttle commander Joe ...