Authorities have already grounded more than 250 flights as a volcanic ash cloud from Iceland's Grímsvötn volcano covers British air space. They appear better prepared to limit the fallout after last year's Iceland volcano disruption.
Strikes at a French deicing fluid factory led to a shortage that grounded planes at Paris's Charles de Gaulle airport as the rest of Europe's transportation system slowly dug out of snow drifts.
Ryanair has announced it is canceling most of its flights until Monday due to the uncertain path of the Iceland volcano ash cloud.
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Clues to Flight 447's failure may lie in Airbus tail section found Monday. Some airlines are starting to replace the instruments, known as Pitot tubes.
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