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TWA (Transcontinental & Western Air) introduced the pressurized Boeing 307 Stratoliner into service on July 8, 1940. The first commercial airliner to have a pressurized cabin, the aircraft was named the Stratoliner for its ability to cruise near the stratosphere at an altitude of over 30,000 feet. This 1940s postcard shows a weather chart with various types of clouds and the weather they typically carry, with the Stratoliner flying smoothly above. Only ten of the airliners were produced: one prototype, five for TWA, three for Pan American, and one for Howard Hughes. postcard: Pan American Airways, weather chart, Boeing 307 Stratoliner; 1940s Gift of Jon E. Krupnick 2022.124.277 https://bit.ly/46lLQ2N This image was posted on July 10, 2023.