Links to websites of aircraft manufacturers that no longer work. At the same time, the manufacturer himself may still be active and have another site.

Aircraft Manufacturer Link Date (Web archive)
CORVUS www.corvus-aircraft.com 2007-02-11
RUSSIAN HELICOPTERS www.russianhelicopters.aero 2020-07-11
ULAN-UDE AVIATION PLANT www.uuaz.ru 2012-03-20