A warbird is any vintage military aircraft now operated by civilian organizations and individuals, or in some instances, by historic arms of military forces.
Although the term originally implied piston-driven aircraft from the World War II era, it is now often extended to include all airworthy former military aircraft, including jet-powered aircraft and helicopters.
The several different types of warbirds include the fighter, trainer, bomber, jet, transports, utility, etc. Examples of aircraft types include the North American P-51 Mustang, Vought F4U Corsair, Boeing B-17 Flying Fortress, North American T-6 Texan, Beechcraft T-34 Mentor, Messerschmitt Bf 109, Hawker Hurricane, and Supermarine Spitfire.
Sometimes, modern production aircraft such as Allison V-1710-powered Yakovlev Yak-9s from Yakovlev and replicas and reproductions of vintage aircraft are called “warbirds”, such as Messerschmitt Me 262s built by the Me 262 Project and Focke-Wulf Fw 190s by Flug + Werk; this can include any one of a large number of different aircraft designs from between World War I and the late 1930s, when military aircraft design was less complex. Such replicated warbirds may even be powered by vintage engines from the era of the aircraft design being flown, as Cole Palen and others associated with his institution did at Palen’s Old Rhinebeck Aerodrome aviation museum with accurate and airworthy reproductions of the Fokker Dr.I, Fokker D.VII, Fokker D.VIII, Sopwith Camel, and Sopwith Dolphin World War I aircraft.