Passengers wait for their flights in a terminal in Oslo Airport Gardermoen
Reuters
"Following advice frm the Met Office, the National Air Traffic Service has reduced restrictions to UK airspace this morning as a result of volcanic ash drifting across the United Kingdom from Iceland," said British airport operator BAA.
Irish, Finnish and Spanish airports have all followed suit.
The drifting ash can damage aircraft engines and it has also clouded visibility.
A volcano on the Eyjafjallajokull glacier in southern Iceland erupted on Wednesday, causing evacuations in the immediate area.