Beginning today, Jan. 23, 2007, ALL travelers, including citizens of the United States, Canada, Mexico, and Bermuda, are required to present a passport to enter the United States when arriving by air from any part of the Western Hemisphere. Exceptions are limited to travelers possessing an Air NEXUS card, U.S. Coast Guard Merchant Mariner Document, or Alien Registration Card (Form I-551). This initiative is part of the departments of State and Homeland Security_s Western Hemisphere Travel Initiative (WHTI) and does not apply to travel between the United States and its territories. As a result, U.S. citizens traveling directly between the United States and Puerto Rico, the U.S. Virgin Islands, Guam, the Northern Mariana Islands and American Samoa can continue to use established forms of identification to board flights and for entry. A separate proposed rule addressing land and sea travel will be published at a later date with specific requirements for travelers entering the United States through land and sea border crossings. As early as Jan.1, 2008, citizens traveling between the United States and Canada, Mexico, Central and South America, the Caribbean, and Bermuda by land or sea may be required to present a valid passport or other documents as determined by the Department of Homeland Security to enter the United States. Click here for additional details.