Flights are to be suspended at airports throughout the north of England, including Manchester and Liverpool, as volcanic ash drifts across the country.
A no-fly zone has been imposed by the Civil Aviation Authority from 1300 until 1900 BST.
East Midlands, Manchester, Liverpool, Doncaster, Humberside and Carlisle airports are all affected.
A spokesman for Liverpool John Lennon Airport said that 30 flights have been affected there.
He advised passengers to check with their airline before travelling.
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