1940 saw the invention of a jet engine by a British engineer Frank Whittle, thus used in fighter planes towards the end of the Second World War, and in commercial passenger liners from 1949, with the British de Havilland Comet.
1940年英国工程师弗兰克·惠特尔发明喷气发动机后,这项技术用于战斗机中直至第二次世界大战结束, 而商用机领域则从1949年的英国哈维兰彗星型客机开始。