The first jet fighter was the Messerschmitt Me 262, piloted by Fritz Wendel. It was the fastest conventional airplane of WW II (the rocket-powered Messerschmitt Me 163 Komet was faster). Mass production started in 1944, too late for a decisive impact.
During the Korean War on November 8, 1950, United States Air Force Lt. Russell J. Brown flying in an F-80, intercepted two North Korean MiG-15s near the Yalu River and shot them down in the first jet-to-jet dogfight in history.
See also: Commercial aviation