CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%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 betterThe closure is dated as a span: the second phase from 14 April "created an ash cloud that led to the closure of most of the European IFR airspace from 15 until 20 April 2010". The pin covers 15-20 April, so its exclusive end is 21 April.[1]
The volcano's second eruptive phase threw ash into the jet stream and about 20 countries shut their airspace to commercial jets. Roughly 10 million travellers were stranded in the worst air-travel disruption since the Second World War.