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The world's first commercial jet airliner to reach production, the de Havilland Comet, had its maiden flight.
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Jet airliner
Passenger aircraft powered by jet engines
A jet airliner or jetliner is an airliner powered by jet engines. Airliners usually have two or four jet engines; three-engined designs were popular in the 1970s but are less common today. Airliners are commonly classified as either the large wide-body aircraft, medium…Source: Wikipedia (CC BY-SA)
De Havilland Comet
First commercial jet airliner, four-engined
The de Havilland DH.106 Comet is the world's first commercial jet airliner. Developed and manufactured by de Havilland in the United Kingdom, the Comet 1 prototype first flew in 1949. It features an aerodynamically clean design with four de Havilland Ghost turbojet engines…Source: Wikipedia (CC BY-SA)