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- 1927 Boeing Model 40-B2 Biplane - Subsidies from the federal government for air mail encouraged the development of improved long-distance aircraft like the Boeing 40. The key to the Boeing's success was the use of a lightweight air-cooled radial engine which allowed it to carry the mail and two paying passengers. This plane flew between Chicago and San Francisco, making 12 fuel stops along the way.

- 1927
- Collections - Artifact
1927 Boeing Model 40-B2 Biplane
Subsidies from the federal government for air mail encouraged the development of improved long-distance aircraft like the Boeing 40. The key to the Boeing's success was the use of a lightweight air-cooled radial engine which allowed it to carry the mail and two paying passengers. This plane flew between Chicago and San Francisco, making 12 fuel stops along the way.