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Luton Airport in London
A sign warns passengers of flight delays and cancellations after Britain's National Air Traffic Control Service ordered the closure of airports at midday and said later that it would last until at least 6 a.m. Friday morning. (10 p.m. Thursday PDT).
- Volcanic ash closes European airports, stranding tens of thousands of travelers
- Video: Raw footage of the ash cloud
- Graphic: Flight hazard
April 15, 2010