Definition
Mail carried by aircraft between designated points, operated historically in the United States as a government-sponsored service that played a central role in the early development of commercial aviation, navigation infrastructure, and pilot training.
Plain English
Letters and packages flown by airplane instead of being carried by train, truck, or ship.
Context Anchor
Seen in aviation history discussions about the early growth of U.S. commercial flying and airline routes.
Derivation
A simple compound of 'air' (the medium of flight) and 'mail' (postal correspondence). The term emerged in the early 1900s to distinguish flown mail from surface mail.
Why Pilots Care
Air mail routes were the foundation of the U.S. airway system. Lighted airways, navigation aids, weather reporting, and the first scheduled passenger airlines all grew directly out of air mail operations.
Intuition Check
Air mail is not just 'mail that happens to fly.' Historically it refers specifically to the early scheduled mail-carrying flights that built much of the aviation infrastructure pilots still rely on today.
Example Sentence 1
The Post Office began regular air mail service between New York and Washington in 1918.
Example Sentence 2
Government air mail contracts gave early aviators steady work and forced them to fly at night and in marginal weather.