Boeing Bird of Prey
- Information on the aircraft, which has made numerous flights since being secretly launched in 1996.
- http://www.air-attack.com/page.php?pid=1

The Society of Experimental Test Pilots
- An international organization that seeks to promote air safety and contributes to aeronautical advancement. Provides information on programs, activities and membership.
- http://www.setp.org

Experimental and Research Aircraft
- Gallery featuring history, specifications, schematics, pictures, and data on several historic planes.
- http://www.aerospaceweb.org/aircraft/research/

The X-Planes Data Site
- X stands for eXperimental, and experimentation is the single purpose of the X-planes.
- http://users.dbscorp.net/jmustain/xpmain.htm

UFOSeek: Military Aircraft
- Links to sites on mystery military aircraft like the Aurora.
- http://www.ufoseek.com/Military_Aircraft/index.html

FAS Mystery Aircraft
- Information on the mystery aircraft of the U.S. military like the Aurora.
- http://www.fas.org/irp/mystery/index.html