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- Delivery of Packages, Express Service by Air to Boston, 1926 - Regular air mail service in the United States started in 1918. After operating flights itself for eight years, the U.S. Post Office Department began contracting with commercial air carriers in 1926. Contract Air Mail (CAM) agreements stimulated the formation of new airline companies, and they encouraged the design of improved airplanes to carry mail and passengers.

- 1926
- Collections - Artifact
Delivery of Packages, Express Service by Air to Boston, 1926
Regular air mail service in the United States started in 1918. After operating flights itself for eight years, the U.S. Post Office Department began contracting with commercial air carriers in 1926. Contract Air Mail (CAM) agreements stimulated the formation of new airline companies, and they encouraged the design of improved airplanes to carry mail and passengers.