Why Iceland's Volcano Is A Hazard For Air Travel

From Time Magazine:

Passengers sitting in planes on the runways of Heathrow Airport outside London on Thursday morning must have wondered what the problem was.

The sky above was clear and blue, yet the British government had closed the country's entire airspace, grounding all flights at five airports and disrupting the itineraries of tens of thousands of travelers — including those whose journeys originated elsewhere in Europe, North America and beyond and who would have only passed through Heathrow, Europe's busiest airport and a major international hub that handles more than 1,200 flights and 180,000 passengers per day.

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