X-43 Hyper-X

• Boeing Joins X-43C Hypersonic Research Vehicle Team  - Facts about the experimental X-43C aircraft that could attain hypersonic speeds.
• NASA X-43 Hyper-X  - Provides information on the Hyper-X project of NASA using air-breathing scam-jet engine.
• SpaceDaily  - News article that talks about the development of hypersonic aircrafts.
• X43A Project Summary  - Features NASA's X-43A scramjet, hypersonic flight research program by NASA. Includes background facts, objectives, videos and links.