All persons, including U.S. citizens, traveling by air between the United States and Canada, Mexico, Central and South America, the Caribbean, and Bermuda are required to present a valid passport, Air NEXUS card, or U.S. Coast Guard Merchant Mariner Document, or an Alien Registration Card, Form I-551, if applicable. International visitors who need a visa to travel to the U.S. can utilize the U.S. Department of State’s Visa Wizard tool to learn what documentation is required and how to obtain it.