Average cost of domestic airfare in 2006, an increase of 7 percent over 2005 $231 Number of international visitors who came to the U.S. in 2006 51.1 million Percent of Americans who don't know that they need a passport to re-enter the country 56 Number of proposed hotel rooms stuck in the planning stage 313,113 Number of exhibitors at the National Restaurant Association convention in Chicago, a record for the event 2,140 Sources (from left): Business Travel Monitor, U.S. Department of ...

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