model 307
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Monster Machines: The Stratoliner Was The First Plane To Fly Above The Storm
In the early days of commercial air travel, planes were limited to just 4267m in order to protect their passengers from the the dangers of thin, high-altitude flying. But in 1938, Boeing changed the face of commercial air travel with the model 307 Stratoliner, the first commercial aeroplane to offer a pressurised cabin.