US: http://www.accuweather.com/blogs/news/story/43213/holiday-airline-passengers-fac-1.asp
EU: http://www.cnn.com/2010/WORLD/europe/12/20/europe.winter.weather/index.html?hpt=T2
US: http://www.accuweather.com/blogs/news/story/43213/holiday-airline-passengers-fac-1.asp
EU: http://www.cnn.com/2010/WORLD/europe/12/20/europe.winter.weather/index.html?hpt=T2