SpaceDaily
- Imagine taking off from any U.S. airport and landing on any other runway in the world in less than two hours. NASA's Hyper - X series.
- http://www.spacedaily.com/news/rocketscience-02q.html

Boeing Joins with X-43C
- An experimental aircraft designed to use innovative air-breathing engine technology to attain hypersonic speeds previously achieved only by rockets.
- http://www.boeing.com/news/releases/2003/q4/nr_031120a.html

X43A Project Summary
- Hyper-X, NASA's multi-year hypersonic flight research program, seeks to overcome one of the greatest aeronautical research challenges - air-breathing hypersonic flight.
- http://www.dfrc.nasa.gov/Research/HyperX/index.html

X-43, X-Planes Data Site
- NASA has established a multi-year experimental hypersonic ground and flight test program called Hyper-X. The program seeks to demonstrate "air-breathing" engine technologies that promise to increase payload capacity or reduce vehicle size for th
- http://users.dbscorp.net/jmustain/x43.htm