Boeing 707 ushering in the Jet Age. It established Boeing as one of the largest manufacturers of passenger aircraft, and led to the later series of airliners with "7x7" designations. The later 720, 727, 737, and 757 share elements of the 707's fuselage design. The 707 was developed from the Boeing 367-80, a prototype jet first flown in 1954. A larger fuselage cross-section and other modifications resulted in the initial-production 707-120, powered by Pratt & Whitney JT3C turbojet engines, which first flew on December 20, 1957. Pan American World Airways began regular 707 service on October 26, 1958. Later derivatives included the
Boeing Renton Factory the Boeing C-97 Stratofreighter for the United States Air Force. In all, 943 C-97s were built in the Renton plant. In May 1954 the prototype of what would become the Boeing 707, the Boeing 367-80, was rolled out at the Renton plant starting a long association with the production of the Boeing 707 line. When the first production Boeing KC-135 Stratotanker first flew in August 1956 from Renton it was named "City of Renton". The first production Boeing 707 was rolled out at Renton on 28 October 1957 and production continued to the last 707. The Boeing 707 final assembly