How can airplanes on short - say 60 minute - duration flights spend half the flight climbing to 34,000ft, and half the flight descending from 34,000ft? - Quora
تويتر \ SFO Museum على تويتر: "#OTD in 1982, the Boeing 757 took its first flight. Designed to be more fuel efficient than its predecessor, the trijet 727, the twinjet 757 was
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