The passport card is the wallet-size travel document that can only be used to re-enter the United States at land border-crossings and sea ports-of-entry from Canada, Mexico, the Caribbean, and Bermuda.
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All U.S. citizens need U.S. passport books if re-entering by air. Land and sea border crossings accept additional travel documents, such as U.S. Passport cards and Trusted Traveler cards. Child travelers have additional options - see the Traveling with Children section.
Entry into the United States: When traveling by air from Canada, U.S. citizens must present a U.S. passport book or other approved identification document. The U.S. Customs and Border Protection (CBP) website provides a full list of allowable documents.
If you're a U.S. citizen, you can travel to Mexico, but you will need a passport card. The passport card is a credit card-sized document that is valid for travel to Mexico, Canada, and the Caribbean.
U.S. nationals, including U.S. dual nationals, must use a U.S. passport to enter and leave the United States. U.S. dual nationals may also be required by the country of their foreign nationality to use that country's passport to enter and leave that country.
A valid passport book is required to enter Mexico by air, and those attempting to enter at an airport with a U.S. passport card only may be denied admission.
If you are in the U.S. and you are flying domestically, the good news is that you do not need your passport. You can fly by showing any photo ID issued by the government. It can be done in all 50 U.S. states. Not only that, but the U.S. overseas territories also allow this.
Can you cross the Mexican border with a birth certificate? Birth certificates are only acceptable as forms of identification for minors traveling to Mexico by road or closed-loop cruises.