USPS
Airmail – USPS Definition
(1) The transport of mail by air transportation. (2) A service by which international mail receives First-Class Mail service domestically, is dispatched by the most expeditious transportation, and receives air or priority handling in the destination country.
Airmail
(1) The transport of mail by air transportation. (2) A service by which international mail receives First-Class Mail service domestically, is dispatched by the most expeditious transportation, and receives air or priority handling in the destination country.