Editing Concorde (section)

===SST and others===
{{further|Supersonic transport}}
The main competing designs for the US government-funded supersonic transport (SST) were the [[swing-wing]] [[Boeing 2707]] and the compound [[delta wing]] [[Lockheed L-2000]]. These were to have been larger, with seating for up to 300 people.<ref>{{cite web |url=http://www.flightglobal.com/pdfarchive/view/1964/1964%20-%200377.html |title=The United States SST Contenders |work=Flight International |date=13 February 1964 |pages=234–35 |access-date=30 June 2011 |archive-date=21 October 2016 |archive-url=https://web.archive.org/web/20161021071648/https://www.flightglobal.com/pdfarchive/view/1964/1964%20-%200377.html |url-status=live}}</ref>{{sfn|Winchester|2005a|p=84}} The Boeing 2707 was selected for development. Concorde first flew in 1969, the year Boeing began building 2707 mockups after changing the design to a cropped delta wing; the cost of this and other changes helped to kill the project.<ref>{{cite news |url=http://select.nytimes.com/gst/abstract.html?res=F10D11F6395F127A93C7A9178AD85F4D8685F9 |title=The Russians Lead With the SST... |first=Richard D |last=Lyons |work=The New York Times |access-date=30 June 2011 |date=5 January 1969 |archive-date=3 November 2012 |archive-url=https://web.archive.org/web/20121103103556/http://select.nytimes.com/gst/abstract.html?res=F10D11F6395F127A93C7A9178AD85F4D8685F9 |url-status=live}}</ref> The operation of US military aircraft such as the Mach 3+ [[North American XB-70 Valkyrie]] prototypes and [[Convair B-58 Hustler]] strategic nuclear bomber had shown that sonic booms were capable of reaching the ground,<ref>{{cite news |url=https://pqasb.pqarchiver.com/chicagotribune/access/574189232.html?dids=574189232:574189232&FMT=CITE&FMTS=CITE:AI&date=Dec+19%2C+1961&author=&pub=Chicago+Daily+Tribune&desc=B-58%27s+SONIC+BOOM+RATTLES+KENTUCKIANS&pqatl=google |title=B-58's Sonic Boom Rattles Kentuckians |work=Chicago Daily Tribune |access-date=30 June 2011 |date=19 December 1961 |archive-date=25 July 2012 |archive-url=https://web.archive.org/web/20120725103200/http://pqasb.pqarchiver.com/chicagotribune/access/574189232.html?dids=574189232:574189232&FMT=CITE&FMTS=CITE:AI&date=Dec+19%2C+1961&author=&pub=Chicago+Daily+Tribune&desc=B-58%27s+SONIC+BOOM+RATTLES+KENTUCKIANS&pqatl=google |url-status=dead}}</ref> and the experience from the [[Oklahoma City sonic boom tests]] led to the same environmental concerns that hindered the commercial success of Concorde. The American government cancelled its SST project in 1971 having spent more than $1&nbsp;billion without any aircraft being built.<ref>{{cite magazine |url=http://www.time.com/time/magazine/article/0,9171,944291,00.html |archive-url=https://web.archive.org/web/20081221203832/http://www.time.com/time/magazine/article/0,9171,944291,00.html |url-status=dead |archive-date=21 December 2008 |title=The Nation: Showdown on the SST |magazine=Time |access-date=30 June 2011 |date=29 March 1971}}</ref>