CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins85% CONFIDENCEOverall confidence: 85%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 better152 days ago
Happened as dated, per nasa.gov[1][3][4]: the X-59 "marked a major milestone Friday, June 5, when it flew faster than the speed of sound for the first time."The quiet supersonic demonstrator reached Mach 1.1 and 43,400 feet on an 81-minute flight from Edwards Air Force Base, the first time it exceeded the speed of sound. A NASA F-15 chase plane flew alongside, its own booms drowning out anything the X-59 made.