You'd better have a big bladder if you plan on flying from Australia, Asia or Europe to the United States. The U.S. Transportation Security Administration has banned passengers from lining up for the bathrooms during flights. Flight attendants are expected to police the toilets, looking for suspicious packages and making sure people aren't trying to form a line. "Passengers are caught between a rock and a hard place. On one hand, they are advised to move around an aircraft during flights for health reasons; but now they are being told not to congregate. It doesn't make sense," said Warren Bennett, chief executive of the Board of Airline Representatives of Australia. It doesn't have to make sense, Mr. Bennett. It's part of the war on terror.