airgraph

English

English Wikipedia has an article on:

airgraph

Wikipedia

Etymology

From air +‎ -graph.

Noun

airgraph (plural airgraphs)

1. (UK, historical) A form of airmail used to send messages to servicemen during the Second World War.
   • 1942 May-June, “The Why and the Wherefore”, in Railway Magazine, page 192, photo caption:

     A recent airgraph from the G.I.P. Railway to "The Railway Magazine"

References

• “airgraph”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.