Passengers queue to check into a flight at Narita airport, east of Tokyo March 17, 2011. Operators of a quake-crippled nuclear plant in Japan dumped water on overheating reactors on Thursday while the United States expressed growing alarm about leaking radiation and urged its citizens to stay well clear of the area. REUTERS/Issei Kato (JAPAN - Tags: DISASTER POLITICS IMAGES OF THE DAY TRANSPORT ENVIRONMENT)