page_title: Boeing 707
section_title: 707-320
hierarchical_section_title: Boeing 707 / Variants / 707-320
caption_attribution_description: Air France Boeing 707 taking off at London Heathrow Airport
context_page_description: The Boeing 707 is a narrow-body airliner produced by Boeing Commercial Airplanes, its first jetliner.
  Developed from the Boeing 367-80, a prototype first flown in 1954, the initial 707-120 first flew on December 20, 1957.
  Pan American World Airways began regular 707 service on October 26, 1958, and it was built until 1979.
  A quadjet, the 707 has a swept wing with podded engines. Its larger fuselage cross-section allowed six-abreast economy seating, retained in the later 720, 727, 737, and 757.
  Although it was not the first commercial jetliner in service, the 707 was the first to be widespread and is often credited with beginning the Jet Age.
  It dominated passenger air transport in the 1960s and remained common through the 1970s, on domestic, transcontinental, and transatlantic flights, as well as cargo and military applications.
  It established Boeing as a dominant airliner manufacturer with its 7x7 series.
  The initial, 145-foot-long 707-120 was powered by Pratt & Whitney JT3C turbojet engines.
  The shortened long-range 707-138 and the more powerful 707-220 entered service in 1959.
  The longer range, heavier 707-300/400 series have a larger wing and stretched slightly by 8 feet.
context_section_description: The 707-320 Intercontinental is a stretched version of the turbojet-powered 707-120, initially powered by JT4A-3 or JT4A-5 turbojets producing 15,800 lbf (70.3 kN) each (most eventually got 17,500 lbf (77.8 kN) JT4A-11s). The interior allowed up to 189 passengers, the same as the -120 and -220 series, but improved two-class capacity due to an 80-in fuselage stretch ahead of the wing (from 138 ft 10 in (42.32 m) to 145 ft 6 in (44.35 m) ), with extensions to the fin and horizontal stabilizer extending the aircraft's length further. The longer wing carried more fuel, increasing range by 1,600 miles (2,600 km) and allowing the aircraft to operate as true transoceanic aircraft. The wing modifications included outboard and inboard inserts, as well as a kink in the trailing edge to add area inboard. Takeoff weight was increased to 302,000 lb (137,000 kg) initially and to 312,000 lb (142,000 kg) with the higher-rated JT4As and center section tanks. Its first flight was on January 11, 1958; 69 turbojet 707-320s were delivered through January 1963, the first passengers being carried (by Pan Am) in August 1959.
caption: The stretched -320, powered by JT4A turbojets
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