| Boeing 307/C-75 Stratoliner | |
|---|---|
 | |
| General information | |
| Type | Airliner |
| National origin | United States |
| Manufacturer | Boeing |
| Status | Retired |
| Primary users | Transcontinental & Western Air |
| Number built | 10 |
| History | |
| Introduction date | July 4, 1940 with Pan American Airways[1][2] |
| First flight | December 31, 1938[1][3] |
| 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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