European airlines have carried out test flights to see if it is safe to fly through volcanic ash from Iceland that has disrupted air travel for four days.
Dutch, German and French carriers sent planes up without suffering obvious damage, prompting some to question whether the risk has been overstated.
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BBC: Flights assess danger from volcano ash amid air chaos
European airlines have carried out test flights to see if it is safe to fly through volcanic ash from Iceland that has disrupted air travel for four days.
