 Airmails of the United States

Airmails of the United States or U.S. Air Mail was a service class of the United States Post Office Department and its successor United States Postal Service delivering mail flown by aircraft within the United States and its possessions and territories.Letters and parcels intended for air mail service were marked as "Via Air Mail" (or equivalent), appropriately franked, and assigned to any then existing class or sub-class of the Air Mail service.