Just a couple of decades ago, aviation had some rules. If you wanted to fly fast within the atmosphere, you used a jet engine. The champion here was the SR-71 Blackbird, designed by Lockheed Martin, ...

Key Points and Summary - A look back at NASA's X-43A, the unmanned experimental aircraft that holds the world record for the fastest flight by an air-breathing jet. -As part of the Hyper-X program, ...