page_title: Boeing Model 40
section_title: Types of Boeing Model 40
hierarchical_section_title: Boeing Model 40 / Types of Boeing Model 40
caption_attribution_description: English: Boeing Model 40 over mountains (probably the Cascade Range) circa 1930s. Boeing Air Transport (later United Airlines) logo.Item 78077, City Light Glass Lantern Slides (Record Series 1204-03), Seattle Municipal Archives.
context_page_description: The Boeing Model 40 was a mail plane. It was made in the 1920s. The Boeing Model 40 was a biplane with one engine. It was used a lot to deliver mail in the 1920s and 1930s. It was the first plane made by Boeing which carried passengers.
context_section_description: Model 40
  Very first design.
  Model 40A
  Another design made in 1927. It had new engines and a cabin which could carry two people. 25 of these were made.
  Model 40B
  These were Model 40As with a new engine. Their name was changed to Model 40B-2.
  Model 40B-4
  Model 40-Bs with a bigger cabin which could carry four people.  It had windows which could be opened. 38 of these were made.
  Model 40B-4A
  One Model 40B used by Pratt & Whitney for testing.
  Model 40H-4
  Four Model 40B-4s which were made by Boeing Canada.
  Model 40C
  Similar to the Model 40B-4, but it had the same engine as the Model 40A. 10 of these were made.
caption: A Boeing Model 40 in the 1930s.
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