No one would dare to seem soft on terrorism these days. But the new security measures imposed on travel to the United States have sparked strong and starkly different reactions around the world, veering from loud cheering to swift retaliation. In a sense, the response provides a fresh global analysis of the trauma of Sept. 11, 2001, as countries and airline companies, unions and associations frame their views according to their perceptions of their own vulnerability to terrorism and of the likelihood that a plane could be transformed into a guided missile against the United States. Rather than one deep divide, in which players line up either with or against the United States, several fissures have been exposed.Full Story