
1) Aerogramme 2) Air letter 3) Airmail letter 4) An airmail letter 5) Letter 6) Lightweight letter 7) Missive 8) Radio message 9) The record of an aerograph 10) Wireless message
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https://www.crosswordclues.com/clue/aerogram

1) Aerogramme
Found on
https://www.crosswordclues.com/clue/aerogram

An Aerogram, Aérogramme or Air Letter is a thin lightweight piece of foldable and gummed paper for writing a letter for transit via airmail, in which the letter and envelope are one and the same. Most postal administrations forbid enclosures in these light letters, which are usually sent abroad at a preferential rate. Printed warnings existed to ...
Found on
http://en.wikipedia.org/wiki/Aerogram

(from the article `postal system`) For individual correspondence, the most practical and inexpensive form of airmail remains the compact aerogram, which was introduced in Britain ...
Found on
http://www.britannica.com/eb/a-z/a/23

aerogram 1. A roentgenogram of an organ afer it has been injected with air; also called pneumogram. 2. A letter designed for airmail consisting of a single sheet of lightweight paper that, once written on, can be folded and sealed to form an envelope.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2778/4

a radiogram. · a message carried by aircraft; an airmail letter. · · a diagram for analyzing thermodynamic processes in the atmosphere. · the record of an aerograph.
Found on
https://www.infoplease.com/dictionary/aerogram
No exact match found.