USPS
Aerogramme – USPS Definition
(obsolete) A postage-paid letter-size sheet of lightweight paper that was folded into an airmail envelope for correspondence to other countries. Enclosures were not permitted. Aerogrammes were discontinued in 2007.
Aerogramme
(obsolete) A postage-paid letter-size sheet of lightweight paper that was folded into an airmail envelope for correspondence to other countries. Enclosures were not permitted. Aerogrammes were discontinued in 2007.