A snow plough passes by an Air France plane when working on the tarmac on December 19, 2010 at Charles de Gaulle-Roissy airport, outside Paris, where some 25% of flights have been cancelled and two on the four runways closed on this morning. The French civil aviation authority on Saturday asked airlines to cancel at least a quarter of their scheduled flights to Roissy between 0700 and 1500 GMT, while 60 percent of flights were delayed on Saturday. .  AFP PHOTO BERTRAND LANGLOIS
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