Aerogram

…The main special handling services include registered mail, receipt notice (a system similar to the domestic delivery certificate, where the recipient signs for receipt), express mail (delivered by a special courier after arriving at the delivery office at the destination), and insurance (a system similar to the domestic registered mail, where in the event of an accident, actual losses are compensated up to the insurance amount). Some countries do not handle some of these types, or have certain restrictions on their handling. Other examples include international postcards (flat rates of 70 yen for airmail and 60 yen for surface mail around the world), air letters (aerogrammes, a single sheet of paper that serves as both an envelope and a letter paper, with a flat rate of 90 yen to send anywhere in the world), and international reply coupons (used when you want a reply without the recipient having to pay postal charges, valid anywhere in the world, and exchanged for postage stamps corresponding to the reply coupons in the destination country).…

*Some of the terminology that mentions "aerogramme" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また，おもな特殊取扱いには書留，受取通知(国内郵便の配達証明とほぼ同じ制度で，受取人が受領の署名をする)，速達(名あて地の配達局に到着後特別の配達員によって配達される)，保険(国内郵便の書留と同様の制度で，事故の場合に保険金額を限度とした実損額が賠償される)の取扱いがあるが，その種類によっては取り扱っていない国や取扱いに一定の制限を加えている国もある。このほか国際郵便はがき(世界各国航空便70円，船便60円の均一料金)，航空書簡(エログラムaerogramme。1枚の紙で封筒と便せんを兼ねたもので，料金は世界中どこへでも90円の均一料金)や国際返信切手券(相手側に郵便料金を負担させずに返事がもらいたいとき等に使われるもので，世界中どこでも通用し，相手国で返信切手券に対応する郵便切手と引き換えられる。…

※「aerogramme」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報