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English definition of “air letter”

air letter

noun [C]     (also aerogramme)
a letter that is sent by aircraft, usually consisting of a single very thin sheet of paper that is folded and then stuck at the edges to form its own envelopeLetters, notes and cardsPaper and stationery
(Definition of air letter noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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