Editing Boeing 767 (section)

===Background===
In 1970, the [[Boeing 747|747]] entered service as the first wide-body jetliner<ref name=Eden_p102/> with a fuselage wide enough to feature a twin-aisle cabin.<ref>{{harvnb|Sutter|2006|p=103}}</ref> Two years later, the manufacturer began a development study, code-named 7X7, for a new wide-body jetliner intended to replace the [[Boeing 707|707]] and other early generation narrow-body airliners.<ref name=n157/><ref name=saver/> The aircraft would also provide twin-aisle seating, but in a smaller fuselage than the existing 747, [[McDonnell Douglas DC-10]], and [[Lockheed L-1011 TriStar]] wide-bodies.<ref name=n157/> To defray the high cost of development, Boeing signed risk-sharing agreements with Italian corporation [[Aeritalia]] and the Civil Transport Development Corporation (CTDC), a consortium of Japanese aerospace companies.<ref name=n156>{{harvnb|Norris|Wagner|1998|p=156}}</ref> This marked the manufacturer's first major international joint venture, and both Aeritalia and the CTDC received supply contracts in return for their early participation.<ref name=n156/> The initial 7X7 was conceived as a [[STOL|short take-off and landing]] airliner intended for short-distance flights, but customers were unenthusiastic about the concept, leading to its redefinition as a mid-size, transcontinental-range airliner.<ref name=n157>{{harvnb|Norris|Wagner|1998|pp=156–57.}}</ref> At this stage the proposed aircraft featured two or three engines, with possible configurations including over-wing engines and a [[T-tail]].<ref name=Eden_p102>{{harvnb|Eden|2008|pp=102–03}}</ref>

[[File:Delta Air Lines Boeing 767-232 Farnborough 1982 Fitzgerald.jpg|thumb|The {{not a typo|767-200}} pictured here made its [[Farnborough Airshow]] debut in 1982. Later it was named the [[Spirit of Delta]] Ship 102 with [[Delta Air Lines]].|alt=Side view of twin-engine jet touching down on runway, with deployed flaps and thrust reversers]]
By 1976, a twinjet layout, similar to the one which had debuted on the [[Airbus A300]], became the baseline configuration.<ref name=no20/> The decision to use two engines reflected increased industry confidence in the reliability and economics of new-generation jet powerplants.<ref name=no20>{{harvnb|Norris|Wagner|1999|pp=20–21}}</ref> While airline requirements for new wide-body aircraft remained ambiguous,<ref name=no20/> the 7X7 was generally focused on mid-size, high-density markets.<ref name=Eden_p102/> As such, it was intended to transport large numbers of passengers between major cities.<ref name=Eden_p103>{{harvnb|Eden|2008|p=103}}</ref> Advancements in civil aerospace technology, including [[high-bypass turbofan|high-bypass-ratio turbofan]] engines, new flight deck systems, [[aerodynamic]] improvements, and more efficient lightweight designs were to be applied to the 7X7.<ref name=n157/><ref name=no19>{{harvnb|Norris|Wagner|1999|pp=18–19}}</ref> Many of these features were also included in a parallel development effort for a new mid-size narrow-body airliner, code-named 7N7, which would become the 757.<ref name=no19/> Work on both proposals proceeded through the airline industry upturn in the late 1970s.<ref name=davies103>{{harvnb|Davies|2000|p=103}}</ref><ref name=n143/>

In January 1978, Boeing announced a major extension of its [[Boeing Everett Factory|Everett factory]]—which was then dedicated to manufacturing the 747—to accommodate its new wide-body family.<ref>{{Harvnb|Birtles|1999|p=8}}</ref> In February 1978, the new jetliner received the 767 model designation,<ref>{{Harvnb|Becher|1999|p=24}}</ref> and three variants were planned: a {{not a typo|767-100}} with 190 seats, a {{not a typo|767-200}} with 210 seats, and a [[trijet]] 767MR/LR version with 200 seats intended for intercontinental routes.<ref name=no20/><ref>{{harvnb|Donald|1997|page=173}}</ref> The 767MR/LR was subsequently renamed 777 for differentiation purposes.<ref name=n159>{{harvnb|Norris|Wagner|1998|pp=159–60}}</ref><ref>{{cite magazine |url= https://www.flightglobal.com/pdfarchive/view/1978/1978%20-%200788.html |title= Boeing 767 and 777 |magazine= Flight International |date= May 13, 1978}}</ref> The 767 was officially launched on July 14, 1978, when United Airlines ordered 30 of the 767-200 variant, followed by 50 more 767-200 orders from [[American Airlines]] and Delta Air Lines later that year.<ref name=n159/> The 767-100 was ultimately not offered for sale, as its capacity was too close to the 757's seating,<ref name=n159/> while the 777 trijet was eventually dropped in favor of standardizing the twinjet configuration.<ref name=no20/>