Here is an excerpt from the American Airlines' (AA.com) website under International Travel: Travel requirements and documents Make sure to check entry requirements with the consulate of the countries you plan to visit before you travel. You’re responsible for bringing the correct documents for international travel. If you don’t have the required documentation and identification, you will not be allowed to board the plane and would be responsible for any resulting costs. Passport A passport is required for all international travel. If you're traveling anywhere overseas, you need a passport to board an international flight and to enter the country. Passport cards will not be accepted as form of I.D. for international air travel. Passports must be: Valid for at least 6 months after the date you enter a foreign country. Kept in good condition, free of any damage beyond normal wear and tear, and material alterations. You may be denied boarding if you travel with a passport that appears damaged or altered. U.S. citizens can use any government-issued form of identification to travel between the U.S., Puerto Rico and the U.S. Virgin Islands.