FRANKFURT AM MAIN, GERMANY – MARCH 12: Snow plows pass Lufthansa airplanes on there way to the runway at Frankfurt International Airport on March 12, 2013 in Frankfurt am Main, Germany. They could not clear away the snow as fast as the snow fall. Europe’s third busiest airport in Frankfurt closed at midday after recording about 12 centimetres of snow. More than 100 flights had already been cancelled and many others were delayed. (Photo by Thomas Lohnes/Getty Images)