The passport book is the only document approved for international travel by air.
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The most basic forms of travel documents are passports, passport cards, and arrival/departure records. These required documents allow U.S. citizens to travel abroad and re-enter the country legally upon return. Arrival/Departure records are used for non-citizens entering the country temporarily.
Special issuance passports (i.e., official, diplomatic, service, or no-fee regular) are used for travel when the bearer is on official business for the U.S. government. Special issuance passports may not be used for personal travel other than entering or exiting your country of assignment.
In fact, there are well over 100 countries that Americans with passports can travel to, visa-free. With just a valid American passport, you can travel to most countries in Europe, Central and South America, and the Caribbean, as well as many other popular tourist destinations.
What is a Tourist Card? A tourist card, which might be called a 'citizenship identity card', is issued to a tourist for a stated period of time. A tourist card is different to a passport or a visa - some countries require all tourists to complete a tourist card before entering the country.
You may not have heard about the U.S. passport card before. The passport card cannot be used for international air travel, but it is still a great ID to have in your wallet. The Transportation Security Administration (TSA) accepts the passport card as ID for domestic flights.