This is a list of experimental aircraft. Most aircraft are marked as experimental when they are first designed, whether or not they are later produced. This list will focus on notable vehicles that never went into production and experimental variations of vehicles that were produced.
For U.S. designs this list will focus primarily on those aircraft that carried the "X" series designation or carried the "X" series designation as a prefix to a prototype, preproduction, or test aircraft.
U.S. "X" designations
Prototype or experimental attack aircraft:
Prototype or experimental bomber aircraft:
This series covers post-World War II fighter development when the newly independent USAF changed the "P" pursuit designation to "F" for fighter.
This series covers fighter development up to the end of World War II. In 1947 the newly independent USAF changed the "P" pursuit designation to "F" for fighter.
U.S. Navy "X" designations
U.S. non-"X" designations
Research Aircraft and prototypes.
Includes research aircraft, private company projects and prototypes produced in competition for Ministry of Defence contracts.
People's Republic of China
Published - July 2009
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