Volcanic ash spreading from Iceland is clouding the skies across much of Northern Europe, disrupting air travel across Europe, and affecting flight plans worldwide. Authorities shut down airspace to all non-emergency flights in Britain, Ireland and Scandinavia as of Thursday morning, with no indication yet when airspace would reopen. The U.K.'s National Air Traffic Service was discussing the issue with airline executives and could issue further safety instructions, especially as the ash plume spreads over the next 24 hours, according to a NATS representative.

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