AEROGRAMME

n. air-mail letter, letter which is transported by aircraft

An Aerogram or Air Letter, also called an aérogramme, 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 authorities forbid enclosures in these light letters, which are usually sent abroad at a preferential rate.
See more at Wikipedia.org...

Noun
1. a letter sent by air mail
(synonym) airmail letter, air letter, aerogram
(hypernym) letter, missive

MARCONIGRAMMA. AEROGRAMMA. RADIOTELEGRAMMA. MESSAGGIO RADIO. MODULO PER LETTERE VIA AEREA