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Airmails of the United States or U.S. Air Mail relates to the servicing of flown mails by the U.S. postal system within the United States, its possessions, and/or territories, marked as Via Air Mail , appropriately franked, and afforded any then existing class or sub-class of U.S. Air Mail service.Domestic U.S. Air Mail was established as a new class of mail service by the United States Post Office Department on May 15, 1918, with the inauguration of the Washington-Philadelphia-New York route. Special airmail stamps were issued for use with this service. Domestic air mail became obsolete in 1975, and international air mail in 1995, when the USPS began transporting First Class mail by air on a routine basis.