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 3 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
DLR's[3] own press release and the EAA both date HY4's first official flight to September 29, 2016.The German Aerospace Center's HY4, the world's first four-seat aircraft powered solely by a hydrogen fuel cell, made its first flight from Stuttgart Airport on September 29, 2016. The Future of Flight features it as a real prototype for zero-emission aviation.
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