1. Most aerograms have an imprinted stamp indicating the prepayment of postage. 2. Example of modern, folded letter sheet which is not an aerogram . 3. But for aerograms , those terms are misleading. 4. However, some countries such as New Zealand, Zimbabwe and Ireland, sell unstamped aerograms . 5. Many other countries have issued aerograms . 6. The aerogram was largely popularized by its use during the Second World War ( 1939 45 ). 7. The US issued a total of 25 aerograms through 1999 . The production of United States aerograms has ceased. 8. The US issued a total of 25 aerograms through 1999 . The production of United States aerograms has ceased. 9. An aerogram is related to a lettersheet, both being designed to have writing on the inside to minimize the weight. 10. Unstamped aerograms are referred to as " formular " aerograms and can be issued by either postal authorities or by private companies.
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