Squadre di spazzaneve al lavoro per pulire le piste dell'aeroporto di Philadelphia

Snow removal crews work to clear runways at Philadelphia International Airport in Philadelphia, Monday, Dec. 27, 2010.
A powerful East Coast blizzard menaced would-be travelers by air, rail and highway Monday, leaving thousands without a way to get home after the holidays and shutting down major airports and rail lines for a second day.
(AP Photo/Matt Rourke)