Boeing Model 40

Model 40
General information
Type	Mail plane
Manufacturer	Boeing
Primary users	Boeing Air Transport Varney Air Lines Pacific Air Transport
Number built	ca. 80
History
Introduction date	July 1, 1927
First flight	July 20, 1925

The Boeing Model 40 is a United States mail plane of the 1920s. It was a single-engined biplane that was widely used for airmail services in the United States in the 1920s and 1930s, especially by airlines that later became part of United Airlines. It became the first aircraft built by the Boeing company to carry passengers.