All persons including citizens of the United States traveling by air between the U.S., Canada, Mexico, the Caribbean and Bermuda are required to present a passport, Merchant Mariner Document (presented by U.S. citizen merchant mariners traveling on official business) or NEXUS Card (NEXUS enrollment is limited to citizens of the United States and Canada, and lawful permanent residents of the United States and Canada). Children will be required to present their own passport.

U.S. Lawful Permanent Residents (LPRs), refugees, and asylees will continue to be able to use their Alien Registration Card (Form I-551), issued by DHS, or other evidence of permanent resident status or refugee or asylee status to apply for entry into the United States. The Western Hemisphere Travel Initiative (WHTI) will not affect travel between the United States and its territories. U.S. citizens traveling directly between the United States, Guam, Puerto Rico, the U.S. Virgin Islands, America Samoa, Swains Island and the Commonwealth of the Northern Mariana Islands willcontinue to be able to use established forms of identification to board flights and for entry.

Starting January 31, 2008, verbal declarations of identity and citizenship alone will no longer be accepted. On this date, U.S. and Canadian citizens entering the U. S. at land and sea ports of entry from within the Western Hemisphere will need to present (1) government-issued proof of citizenship, such as a birth certificate, along with (2) government issued photo ID, such as a driver’s license. ( Important Change in International Land and Sea Travel Document Procedures )

While a passport or other comparable document is not currently required for entry by land or sea, U.S. and Canadian citizens are highly encouraged to carry proof of identity and citizenship. Travelers 19 years and older should also carry government-issued photo ID. Please visit "Ready, Set... Go!" for the latest information on travel requirements. ( Ready, Set... Go! )

Full WHTI implementation is currently planned for the summer of 2009. Ample advance notice will be provided to enable the public to obtain acceptable documents for land/sea entries to the United States.