Development and Design
In 1935 Boeing designed a four-engined airliner based on its B-17 heavy bomber (Boeing Model 299), then in production, calling it the Model 307. It combined the wings, tail, rudder, landing gear, and engines from their production B-17C with a new, circular cross-section fuselage of 138 in (351 cm) diameter, designed to allow pressurization.
The first order, for two 307s (named Stratoliners), was placed in 1937 by Pan American Airways; it was followed shortly by an increase to six by Pan Am, and a second order for five from Transcontinental & Western Air (TWA), prompting Boeing to begin production on an initial batch of the airliner.
Read more about this topic: Boeing 307
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