- NASA Marshall Center Space Transportation
 - NASA's initiatives to dramatically improve access to space. - SpaceShipOne@
- Find sites for SpaceShipOne and its carrier aircraft White Knight, the world's first privately funded manned space programme. Sites feature background information, special reports, mission objectives and results, and launch video clips of the experimental air-launched suborbital spaceplace which used a hybrid rocket motor.
- Wikipedia: Reusable Launch System
- Article about reusable launch vehicles (RLV), launch vehicles which are capable of launching into space more than once.
- X-15 Rocket Plane, The
- Description and photographs of the North American X-15, the rocket plane that took test pilots to the edge of space for the first time.
- X-33 History Project Home Page
- Demonstrating the key design and operational aspects of a Single Stage to Orbit (SSTO) Reusable Launch Vehicle (RLV) rocket system.
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