CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins80% CONFIDENCEOverall confidence: 80%How well the pin's source and references back up its dates.Weighted average of how firmly 5 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 on the prototype: "CCCP-68001 first went supersonic 5 June 1969. It reached Mach 2.02 on 26 May 1970"; AeroCorner[5]: "On June 5, 1969, the aircraft had its first supersonic flight".The Tu-144 prototype went supersonic for the first time on 5 June 1969, four months before Concorde, and reached Mach 2.02 on 26 May 1970.
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