With the approach of WW2 the de Havilland Aerodrome at Hatfield went through a major expansion, concentrating on Mosquito production and development. The Company also pioneered the production and development of jet engines led by Major Frank Halford, leading to the Vampire jet fighter. Early commercial aircraft were the Dove and Heron, but the major pioneering programme was the Comet, the world's first commercial jet airliner, which first flew on...
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