Stranded passengers seek advice at an information desk at City Airport after all flights were cancelled when ash from a volcanic eruption in Iceland caused the UK's airspace to be closed, in London April 15, 2010. A huge ash cloud from an Icelandic volcano turned the skies of northern Europe into a no-fly zone on Thursday, stranding hundreds of thousands of passengers. The european air safety organisation said the disruption, the biggest seen in the region, could last another two days and a leading volcano expert said the ash could present intermittent problems to air traffic for six months if the eruption continued.REUTERS/Andrew Winning (BRITAIN - Tags: TRAVEL ENVIRONMENT)