The first jet aircraft was the Heinkel He178 flown in 1939.
The first turbojet powered aircraft was German Luftwaffe's Heinkel He-178. It was flown for the first time on August 27, 1939.
Germany
The first airplane wasn't flown in 1920, it ws flown in 1903. By 1920, dozens of different aircraft were being flown.
Heinkel in Germany built the first flying jet aircraft.
The Comet
The first aircraft successfully flown was in 1903, it was invented years before that.
The first turbojet aircraft to fly was the Heinkel He 178
Lufthansa's first aircraft was a Convair 340 Metroliner, delivered in August 1954.
In 1941, Grumman Aircraft Engineering Corporation made planes with folded wings that took up less space on aircraft carriers. In 1941, a jet fighter prototype was flown successfully, although the jet engine itself was produced several years before.
The Me 262 was built by Messerschmitt A G.
heinkel-he-178Pioneering first aircraft to fly under turbojet power, 27 August 1939.