“At the start of what should be a booming summer season, with the entire country virtually on sale because of the falling value of the dollar, an international pall has settled over the US travel industry. More foreign tourists are coming to the US but not in the numbers expected. The problem is not economic, but political, travel and international-relations experts agree. A poor US image abroad, coupled with overblown concerns about visa and security hassles, is keeping international visitors away.”