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