Editing Boeing 777 (section)

===Experimental===
{{main|ecoDemonstrator}}
[[File:Boeing 777-200ER ecoDemonstrator N861BC.jpg|thumb|The 2022 ecoDemonstrator, a 777-200ER]]

Boeing has used 777 aircraft in two research and development programs. The first program, the [[Quiet Technology Demonstrator]] (QTD) was run in collaboration with Rolls-Royce and General Electric to develop and validate engine intake and exhaust modifications, including the chevrons subsequently used in the 737 MAX, 747-8 and 787 series. The tests were flown in 2001 and 2005.<ref name="BFrontiersQTD2">{{cite web |last1=Burnett |first1=Bob |title=Ssshhh, we're flying a plane around here |url=https://www.boeing.com/news/frontiers/archive/2005/december/ts_sf07.html |website=Boeing |access-date=19 November 2022 |date=December 2005}}</ref>

A further program, the [[ecoDemonstrator]] series, is intended to test and develop technologies and techniques to reduce [[Environmental effects of aviation|aviation's environmental impact]]. The program started in 2011, with the first ecoDemonstrator aircraft flying in 2012. Various airframes have been used since to test a wide variety of technologies in collaboration with a range of industrial partners. 777s have been used on three occasions as of 2024. The first of these, a 777F in 2018, performed the world's first commercial airliner flights using 100% [[Aviation biofuel|sustainable aviation fuel (SAF)]].<ref name="Key2018">{{cite web |last1=Broadbent |first1=Mark |title=Commercial Boeing ecoDemonstrator |url=https://www.key.aero/article/triple-seven-testbed |website=Key.Aero |publisher=Key Publishing Ltd. |access-date=19 November 2022 |date=27 June 2019}}</ref> In 2022-4, the testbed is a 777-200ER.<ref name="Backgrounder 22">{{cite web |title=Backgrounder: The Boeing ecoDemonstrator Program (June 2022) |url=https://www.boeing.com/resources/boeingdotcom/principles/environment/pdf/BKG-ecoDemonstrator_2022.pdf |archive-url=https://web.archive.org/web/20220620120530/https://www.boeing.com/resources/boeingdotcom/principles/environment/pdf/BKG-ecoDemonstrator_2022.pdf |archive-date=2022-06-20 |url-status=live |page=3 |website=Boeing |access-date=22 November 2022}}</ref>