Airgram
Encyclopedia
An airgram is a U.S. diplomatic term for a message sent by courier via the diplomatic bag
Diplomatic bag
A diplomatic bag, also known as a diplomatic pouch is a kind of receptacle used by diplomatic missions. The physical concept of a "diplomatic bag" is flexible and therefore can take many forms e.g. an envelope, parcel, large suitcase or shipping container, etc...

 instead of by telegram.
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