Back بوينغ 307 ستراتولاينر Arabic Boeing 307 Stratoliner Catalan Boeing 307 Stratoliner Czech Boeing 307 Danish Boeing 307 German Boeing 307 Spanish بوئینگ ۳۰۷ استراتولاینر Persian Boeing 307 Finnish Boeing 307 French Boeing 307 Stratoliner Frisian
| Boeing 307/C-75 Stratoliner | |
|---|---|
| |
| Role | Airliner |
| National origin | United States |
| Manufacturer | Boeing |
| First flight | December 31, 1938[1][2] |
| Introduction | July 4, 1940 with Pan American Airways[1][3] |
| Status | Retired |
| Primary users | Transcontinental & Western Air Aigle Azur United States Army Air Forces Pan American Airways |
| Number built | 10 |
| Developed from | Boeing B-17 Flying Fortress |
The Boeing Model 307 Stratoliner (or Strato-Clipper in Pan American service, or C-75 in USAAF service) is an American stressed-skin four-engine low-wing tailwheel monoplane airliner derived from the B-17 Flying Fortress bomber, which entered commercial service in July 1940. It was the first airliner in revenue service with a pressurized cabin, which with supercharged engines, allowed it to cruise above the weather. As such it represented a major advance over contemporaries, with a cruising speed of 220 mph (350 km/h) at 20,000 ft (6,100 m) compared to the Douglas DC-3's 160 mph (260 km/h), at 8,000 ft (2,400 m) then in service.[4] When it entered commercial service it had a crew of five to six, including two pilots, a flight engineer, two flight attendants and an optional navigator, and had a capacity for 33 passengers, which later modifications increased, first to 38, and eventually to 60.
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