Effective January 2007: U.S. citizens traveling by air between the United States and Canada, Mexico, Central and South America, the Caribbean, and Bermuda will be required to present a valid U.S. passport, Air NEXUS card, or U.S. Coast Guard Merchant Mariner Document.
Effective January 1, 2008: It is anticipated that on January 1, 2008, U.S. citizens traveling between the U.S. and Canada, Mexico, Central and South America, the Caribbean, and Bermuda by land or sea (including ferries), may be required to present a valid U.S. passport or other documents as determined by the Department of Homeland Security. While recent legislative changes permit a later deadline, the Departments of State and Homeland Security are working to meet all requirements as soon as possible. Ample advance notice will be provided to enable the public to obtain passports or passport cards for land/sea entries.
Note: This will not affect travel between the United States and its territories. U.S. citizens traveling directly between the United States, Puerto Rico, the U.S. Virgin Islands, Guam, the Northern Mariana Islands, and American Samoa will continue to be able to use established forms of identification to board flights and for entry.