Experimental

Boeing Bird of Prey - - Information on the aircraft, which has made numerous flights since being secretly launched in 1996.

Experimental and Research Aircraft - - Gallery featuring history, specifications, schematics, pictures, and data on several historic planes.

FAS Mystery Aircraft - - Information on the mystery aircraft of the U.S. military like the Aurora.

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.

UFOSeek: Military Aircraft - - Links to sites on mystery military aircraft like the Aurora.

X-Planes 2000 - - News, links, and information about the F-16XL, Joint Strike Fighter, UCAVs, X-43, X-44, and other experimental aviation craft.

The X-Planes Data Site - - X stands for eXperimental, and experimentation is the single purpose of the X-planes.