An Austrian Airlines Fokker 100 plane prepares to take off on the runway at the Chopin International Airport in Warsaw October 22, 2012. Heavy fog delayed morning flights at Warsaw airports with many of them either redirected to neighbouring cities or waiting for the fog to temporarily dissipate before landing, airport authorities said. REUTERS/Kacper Pempel (POLAND - Tags: TRANSPORT ENVIRONMENT) - GM1E8AM1GAR01Nevoeiro atrasa voos no aeroporto de LisboaNevoeiro atrasa voos no aeroporto de LisboaSociedade