Editing Boeing 767 (section)

=== Continued development ===

==== 767-X (partial double-deck) ====
{{See also|Boeing 777#Background}}
After the debut of the first stretched 767s, Boeing sought to address airline requests for greater capacity by proposing larger models, including a partial double-deck version informally named the "Hunchback of Mukilteo" (from a town near Boeing's Everett factory) with a 757 body section mounted over the aft main fuselage.<ref>{{cite web |last=McKinzie |first=Gordon |title=How United Airlines Helped Design The World's Most Remarkable Airliner |url=http://www.aiaa.org/sections/cl/what/mckinzie.htm |archive-url=https://web.archive.org/web/20090601173533/http://www.aiaa.org/sections/cl/what/mckinzie.htm |archive-date=June 1, 2009 |access-date=July 1, 2011 |publisher=American Institute of Aeronautics and Astronautics}}</ref><ref name="Norris_Wagner_777_p11-13">{{harvnb|Norris|Wagner|2001|pages=11–13, 15}}</ref> In 1986, Boeing proposed the 767-X, a revised model with extended wings and a wider cabin, but received little interest.<ref name="Norris_Wagner_777_p11-13" /> The 767-X did not get enough interest from airlines to launch and the model was shelved in 1988 in favor of the [[Boeing 777]].<ref name="Norris_Wagner_777_p11-13" /><ref>{{Cite web |url=https://secure.boeingimages.com/archive/Boeing-767-X-Concept--1986-2JRSXLJ8PSVI.html |title=Boeing Images - Boeing 767-X Concept, 1986 |website=secure.boeingimages.com}}</ref>

==== 767-400ERX ====
In March 2000, Boeing was to launch the 259-seat 767-400ERX with an initial order for three from [[Kenya Airways]] with deliveries planned for 2004, as it was proposed to [[Lauda Air]].<!--ref name=Flight20march2000--> 
Increased [[MTOW|gross weight]] and a [[tailplane]] fuel tank would have boosted its range by {{convert|11100|to|12025|km|nmi|-1|order=flip}}, and GE could offer its {{cvt|65000-68000|lbf|kN}} [[CF6]]-80C2/G2.<ref name=Flight20march2000>{{cite web |url=http://www.flightglobal.com/pdfarchive/view/2000/2000%20-%200694.html |title=Lauda and Kenya eye heavy 767 |last=Norris |first=Guy |work=Flight International |date=March 20, 2000}}</ref> Rolls-Royce offered its {{cvt|68,000-72,000|lbf|kN}} [[Rolls-Royce Trent#Second Trent 600|Trent 600]] for the 767-400ERX and the [[Boeing 747#747X and 747X Stretch|Boeing 747X]].<ref name=Flight25July2000>{{cite web |url=http://www.flightglobal.com/pdfarchive/view/2000/2000-1%20-%200364.html |title=R-R offers Trent 600 for 767-400ERX and 747X |work=Flight International |author=Julian Moxon, Guy Norris |date=July 25, 2000}}</ref>

Offered in July, the longer-range -400ERX would have a strengthened wing, fuselage and landing gear for a 15,000&nbsp;lb (6.8&nbsp;t) higher [[Maximum takeoff weight|MTOW]], up to 465,000&nbsp;lb (210.92 t).<!--ref name=Boeing26july2000-->
Thrust would rise to {{cvt|72,000|lbf|kN}} for better takeoff performance, with the Trent 600 or the General Electric/Pratt & Whitney [[Engine Alliance]] GP7172, also offered on the 747X.<!--ref name=Boeing26july2000-->
Range would increase by {{Cvt|525|nmi|mi km|abbr=on}} to {{Cvt|6,150|nmi|mi km|abbr=on}}, with an additional fuel tank of {{Cvt|2145|USgal|L|abbr=on}} in the horizontal tail.<!--ref name=Boeing26july2000-->
The 767-400ERX would offer the capacity of the [[Airbus A330-200]] with 3% lower fuel burn and costs.<ref name=Boeing26july2000>{{cite press release |url= https://boeing.mediaroom.com/2000-07-26-The-Newest-Boeing-767-Is-Inspired-By-The-Future-Introducing-The-Boeing-767-400ER |title= The Newest Boeing 767 Is Inspired By The Future - Introducing The Boeing 767-400ER |date= July 26, 2000 |publisher= Boeing}}</ref>
Boeing cancelled the variant development in 2001.<ref name=sonic/> Kenya Airways then switched its order to the 777-200ER.<ref>{{Cite news |last=Wallace |first=James |url=http://www.seattlepi.com/default/article/Kenya-Airways-sticks-to-Boeing-1083149.php |title=Kenya Airways sticks to Boeing |work=Seattle Post-Intelligencer |date=March 19, 2002}}</ref>

==== 767-XF (re-engine) ====
In October 2019, Boeing was reportedly studying a [[Re-engine|re-engined]] 767-XF for entry into service around 2025, based on the 767-400ER with an extended landing gear to accommodate larger [[General Electric GEnx]] turbofan engines.<!--ref name=Flight10oct2019-->
The cargo market is the main target, but a passenger version could be a cheaper alternative to the proposed [[Boeing New Midsize Airplane|New Midsize Airplane]].<ref name=Flight10oct2019>{{cite news |url= https://www.flightglobal.com/news/articles/boeing-examines-genx-powered-767-x-for-cargo-and-pa-461386/ |title= Boeing examines GEnx-powered 767-X for cargo and passenger roles |date= October 10, 2019 |work= Flightglobal}}</ref>