Aircraft flown once

flying boat, commonly known as "Spruce Goose"

S. A. Andrée's Arctic Balloon Expedition of 1897

1945 attack aircraft prototype by Nakajima; first jet aircraft built in Japan

Prototype flying wing fighter aircraft

fighter aircraft

Quiet STOL aircraft proposal

First transport balloon to cross the Atlantic ocean

fighter aircraft prototype model by Thomas-Morse

type of aircraft

Polish high-altitude balloon (1938)

type of aircraft

Osoaviakhim-1 was a record-setting, hydrogen-filled Soviet high-altitude balloon designed to seat a crew of three and perform scientific studies of the Earth's stratosphere. On January 30, 1934, on its maiden flight, which lasted over 7 hours, the balloon reached an altitude of . During the descent, the balloon lost its buoyancy and plunged into an uncontrolled fall, disintegrating in the lower atmosphere. The three crew members, probably incapacitated by high g-forces in a rapidly rotating gondola, failed to bail out and were killed by the high-speed ground impact.

type of aircraft

1935 American high-altitude balloon

Belgian 1938 pressurised aircraft

early aeroplane dubbed "worst plane ever built"