CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins83% CONFIDENCEOverall confidence: 83%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
This Day in Aviation[1]: "31 December 1968: At Zhukovsky Airport ... the prototype Tupolev Tu-144 supersonic airliner took off on its first flight"; Guinness World Records[2] lists "31 December 1968" for the first supersonic airliner.The Soviet Tupolev Tu-144 prototype CCCP-68001 flew for 37 minutes from Zhukovsky on 31 December 1968, two months before Concorde, to become the first supersonic airliner to fly.
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