US-built pressurized airliner with 4 piston engines, 1938
Boeing 307/C-75 Stratoliner
Role
Airliner
Type of aircraft
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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^Davies, 2000, p.52
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The Boeing Model 307Stratoliner (or Strato-Clipper in Pan American service, or C-75 in USAAF service) is an American stressed-skin four-engine low-wing...
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