Definition
A mail service in which letters and parcels are carried by aircraft between designated airfields, often operated under government contract. In aviation history, airmail refers specifically to the early U.S. Post Office and later contract carrier operations that established many of the routes, navigation aids, and procedures that became the foundation of commercial aviation.
Plain English
Mail that is flown by aircraft instead of being carried by train, truck, or ship. In aviation history, it also refers to the early flying jobs where pilots were paid to deliver mail across the country.
Context Anchor
Seen in aviation history discussions about the early growth of commercial flying in the United States.
Derivation
A simple combination of 'air' and 'mail' -- mail moved by air. The term came into common use in the 1910s as the first scheduled mail flights began. Worth noting because 'airmail' is not just a delivery method; in aviation history it names a whole era of flying.
Why Pilots Care
Those airmail routes directly created the lighted airways and airport network still used today.
Intuition Check
Don't picture only an envelope with a red-and-blue border. In aviation history, 'airmail' refers to the flying operation itself -- the pilots, aircraft, and routes that carried the mail -- not just the letters.
Example Sentence 1
The early airmail pilots flew open-cockpit biplanes through poor weather to keep mail moving on schedule.
Example Sentence 2
The reliability shown by airmail service encouraged the first passenger airlines to start operations on the same routes.