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Boeing Commercial Airplanes
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins77% CONFIDENCEOverall confidence: 77%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
HistoryLink[1], AeroCorner[2] and Wikipedia's[3][4] Lockheed L-2000 article all give 31 December 1966; Wikipedia's Boeing 2707 article says the winner was announced on 1 January 1967.On 31 December 1966 the federal government chose Boeing's swing-wing design over Lockheed's L-2000 to build the American supersonic airliner, later designated the Boeing 2707.
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