The airplane’s circular fuselage provided maximum space for five crew members and the Stratoliner was the first land-based airliner to have a flight engineer as a member of the crew.
First flown in 1938, the Boeing 307 Stratoliner was the first four-engine airliner with a pressurized cabin, allowing it to cruise at an altitude of 20,000 feet, well above the clouds and higher than rough weather. Pan American entered the B-307 into scheduled domestic service on July 4, 1940, with routes to Latin America, and from New York to Los Angeles. The nearly 12-foot-wide cabin carried thirty-three passengers in comfort and provided space for comfortable berths for overnight travelers, as well as observation areas for those who bought the more expensive seats. The airplane’s circular fuselage provided maximum space for five crew members and the Stratoliner was the first land-based airliner to have a flight engineer as a member of the crew.