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Members of airport staff sit outside a deserted terminal at the Birmingham International Airport in Birmingham, central England, on April 17, 2010. Britain has extended a ban on most flights in its airspace until 1:00 am (0000 GMT) Sunday, as the volcanic ash cloud from Iceland was 'moving around and changing shape', air authorities said. Some 16,000 flights in European airspace on Saturday have been cancelled due to the cloud of volcanic ash from Iceland that is still lingering over the continent, Eurocontrol said. AFP PHOTO/BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)

Members of airport staff sit outside a deserted terminal at the Birmingham International Airport in Birmingham, central England, on April 17, 2010. Britain has extended a ban on most flights in its airspace until 1:00 am (0000 GMT) Sunday, as the volcanic ash cloud from Iceland was 'moving around and changing shape', air authorities said. Some 16,000 flights in European airspace on Saturday have been cancelled due to the cloud of volcanic ash from Iceland that is still lingering over the continent, Eurocontrol said.  AFP PHOTO/BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)