All travelers must have a passport book for international air travel. Please note that hospital-issued birth certificates, voter registration cards, and affidavits cannot be used.
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Departure requirementsA secure document is a passport, U.S. permanent resident card, or Stateless travel document, Re-Entry Permit, NEXUS card, U.S Merchant Mariner Card, military ID or emergency travel document issued by an embassy or consulate.
The most likely scenario is that you will be prevented from boarding transport by the staff on duty. If you managed to avoid that situation, you could be blocked from entering your destination by border authorities upon arrival. Generally, it is necessary to have a valid passport if you want to travel abroad.
U.S. Passport. Trusted Traveler Program card (NEXUS, SENTRI or FAST) (see below) U.S. Military identification card when traveling on official orders, or. U.S. Merchant Mariner document when traveling in conjunction with official maritime business.
If your passport's time is almost up, don't wait — start the renewal process now. You can't travel while your renewal application is being processed, and you need to make sure your travel documents are valid for at least six months past the dates of any planned international trips.
To clarify, U.S. citizens entering Mexico must present proof of citizenship (such as a certified copy of a birth certificate), photo ID and proof of sufficient funds. A passport and visa are not required of U.S. citizens entering Mexico for tourism or for transit for stays of up to 90 days.