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The Boeing 307 Stratoliner was put into service #onthisday in 1940 by both Pan American and Transcontinental & Western Air (TWA). The Stratoliner was the first commercial airliner put into service to have a pressurized cabin. Named for its ability to cruise near the stratosphere, the airliner had a circular cross-section, tear-drop-shaped fuselage to handle the stresses of pressurization. Only ten were produced: one prototype, five for TWA (Transcontinental & Western Air), three for Pan American, and one for Howard Hughes. The airline touted its quietness, speed, and advanced capability of flying above bad weather and turbulence. This image was posted on July 08, 2022.

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This post mentions the following things involved with the SFO Museum collection:

Pan American Airways. It is related to Pan American World Airways (the company) .
TWA (Trans World Airlines). It is related to TWA (Trans World Airlines) (the company) .