In Europe, skies have been opened on Wednesday for business but it could take days, or weeks, to clear the backlog created by grounding of flights in view of volcanic ash spreading from Iceland. Britain reopened its airspace last night, giving a huge boost to travellers and air freight. Britain's Civil Aviation Authority made clear that scientists and manufacturers had downgraded the risk of flying in areas of relatively low ash concentrations. Air France also plans to run all long-haul flights on Wednesday, Poland will reopen its airspace from 1030 IST, and the Dutch allowed night flights from Tuesday after taking the lead in allowing passenger flights on Monday. Germany, with the major Frankfurt hub, kept its airspace largely closed until at least 0530 IST. Some 800 flights operated on Tuesday. Finland has also opened its airspace for international traffic to fly over the country Icelandic officials said late Tuesday there was less activity from the volcano under the Eyjafjallajokull glacier. An expert from the World Meteorological Organisation said in Geneva that a low pressure weather system moving into Iceland should help clear the ash cloud within days. British Airways chief executive Willie Walsh told BBC that to get back to normal levels of operation from an airline industry point of view will take weeks. Steve Ridgway, chief executive of Virgin Atlantic, said the reopening of airspace is good news both for passengers and the industry as a whole, but it is likely to take several days to get everyone who has been affected to their destinations.