Boeing 307 Stratoliner
United States — four-engine commercial monoplane

Archive Photos 2

Boeing 307 "Stratoliner" "Clipper Flying Cloud" (NC19903) at the National Air and Space Museum Steven F. Udvar-Hazy Center, Chantilly, Virginia (Photos by Jim Hough)

Overview 2

The Boeing Model 307 Stratoliner was the first commercial transport aircraft with a pressurized cabin. This feature allowed the plane to cruise at an altitude of 20,000 ft (6,000 m), well above weather disturbances. The pressure differential was 2.5 psi (17 kPa), so at 14,700 ft (4,480 m) the cabin altitude was 8,000 ft (2,440 m). The Model 307 had capacity for a crew of five and 33 passengers. The cabin was nearly 12 ft (3.6 m) across. It was the first plane to include a flight engineer as a crew member.

Operational History 2

A total of 10 Stratoliners were built. The first flight was on December 31, 1938. Boeing 307 prototype NX 19901 crashed on March 18, 1939 during a test flight. By 1940 it was flying routes between Los Angeles and New York, as well as to locations in Latin America. Multi-millionaire Howard Hughes purchased a model for his personal use, and had it transformed into a luxurious "flying penthouse". This plane was later sold to oil tycoon Glenn McCarthy in 1949. Haiti and the United States have used the 307 in military operations.

Variants 2

Operators 2

Civilian Operators

Military Operators

Survivors 2

Boeing Model 307 Specifications 4




Tail Unit


Power Plant



Weights (Wright Cyclone G-102 Engines)

Weights (Pratt & Whitney Wasp 1830-C Engines)

Performance (Wright Cyclone G-102 engines)

Performance (Pratt & Whitney Wasp 1830-C engines)


  1. Shupek, John. Boeing Model 307 3-view drawing via The Skytamer Archive, copyright © 2017 Skytamer Images. All Rights Reserved
  2. Hough, Jim. Photos via The Skytamer Archive, copyright © 2004 Jim Hough. All Rights Reserved
  3. Wikipedia, the free encyclopedia. Boeing 307
  4. Grey, C. G. and Leonard Bridgman. The Boeing 307. Jane’s all the World’s Aircraft 1937. London: Sampson Low, Marston & Company, Ltd., 1937, p. 279c-280c. Print.


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