Other countries require either a passport valid on arrival or a passport valid throughout the period of the intended stay. Some countries have bilateral agreements with other countries to shorten the period of passport validity required for each other's citizens[122][123] or even accept passports that have already expired (but not been cancelled).[124]
P athletes, entertainers, and artists: The time period necessary to accomplish the event or activity, plus ten days before the validity period of the visa petition and up to ten days after the petition expires. Initially up to five years for athletes, one year for other artists and entertainers. Extensions possible. Ten-year maximum for athletes; no maximum on others.

ESTA registration is required for all travelers to the United States under the Visa Waiver Program. There is a US$14 fee for ESTA registration. The fee can be paid online using any of the following credit cards: Visa, MasterCard, American Express, or Discover. Third parties (travel agents, family members, etc.) can pay your ESTA fee for you if you do not have the correct type of credit card. If the ESTA registration is denied, the fee is only US$4.
In addition, green card holders and certain other aliens must obtain a certificate of compliance (also known as a "sailing permit" or "departure permit") from the Internal Revenue Service proving that they are up-to-date with their US income tax obligations before they may leave the country.[114] While the requirement has been in effect since 1921, it has not been stringently enforced, but in 2014 the House Ways and Means Committee has considered to begin enforcing the requirement as a way to increase tax revenues.[115]
If a traveler’s main reason for being in a country is simply to pass through en route to another final destination, the country may issue a transit visa. For example, Australia issues transit visas for stays up to 72 hours for people in transit and for crew members arriving to work on flight or ocean vessels. Most countries do not require visas for travelers who arrive to change planes but never leave the secure airport areas. However, a more restrictive kind of visa called an airside transit visa is required by some countries even for travelers who remain in the airport.
In the absence of specific bilateral agreements, countries requiring passports to be valid for at least 6 more months on arrival include Afghanistan, Algeria, Anguilla, Bahrain,[119] Bhutan, Botswana, British Virgin Islands, Brunei, Cambodia, Cameroon, Cape Verde, Cayman Islands, Central African Republic, Chad, Comoros, Costa Rica, Côte d'Ivoire, Curaçao, Ecuador, Egypt, El Salvador, Equatorial Guinea, Fiji, Gabon, Guinea Bissau, Guyana, Haiti, Indonesia, Iran, Iraq, Israel,[120] Jordan, Kenya, Kiribati, Kuwait, Laos, Madagascar, Malaysia, Maldives, Marshall Islands, Mongolia, Myanmar, Namibia, Nepal, Nicaragua, Nigeria, Oman, Palau, Papua New Guinea, Philippines, Qatar, Rwanda, Samoa, Saudi Arabia, Singapore, Solomon Islands, Somalia, Sri Lanka, Sudan, Suriname, Tanzania, Thailand, Timor-Leste, Tokelau, Tonga, Tuvalu, Uganda, United Arab Emirates, Vanuatu, Venezuela, and Vietnam.[121]
Azerbaijan also strictly bans any visit by foreign citizens to the separatist region of Nagorno-Karabakh[138] (the de facto independent Republic of Artsakh), its surrounding territories, and the Azerbaijani exclaves of Karki, Yuxarı Əskipara, Barxudarlı, and Sofulu which are de jure part of Azerbaijan but under the control of Armenia, without the prior consent of the government of Azerbaijan. Foreign citizens who enter these territories will be permanently banned from entering the Republic of Azerbaijan[139] and will be included in their "list of personae non gratae".[140] As of 21 February 2019, the list mentioned 803 people.
A general certificate of health is not required by CDC for pet cats and dogs entering the United States, although some airlines or states may require them. Certain states require vaccination for rabies, check with state and local health authorities at your final destination. Dogs must have a certificate showing they have been vaccinated against rabies greater than or equal to 30 days prior to entry into the United States, unless they're coming from rabies free countries. All pet cats and dogs arriving in the state of Hawaii and the territory of Guam are subject to locally imposed quarantine requirements. Many animals are not allowed to be brought into the USA; you can find a complete list on the US Customs and Border Protection website (www.cbp.gov).
Each country has its own visa application requirements. Make sure to check with your destination country’s appropriate government website to find out. Requirements typically include filling out the visa application form, providing your passport for stamping if required, a photograph, and additional documents such as your flight itinerary, hotel booking or letter of invitation.
So, for example, someone who arrives in the U.S. with a fiancé visa (K-1) and applies for a work permit will receive one that lasts only until the 90-day termination of that person’s K-1 visa. Although it might sound like this would create problems for fiancés who plan to apply for green cards after marriage and stay in the United States, it actually doesn’t. That’s because the fiance can simply apply to adjust status as soon as they’ve gotten married, and then apply for an EAD that lasts even longer, at that time.
The United States is an open society. Unlike many other countries, the United States does not impose internal controls on most visitors, such as registration with local authorities. Our immigration law requires consular officers to view every visa applicant as an intending immigrant until the applicant proves otherwise. In order to enjoy the privilege of unencumbered travel in the United States, you have a responsibility to prove you are going to return abroad before a visitor or student visa is issued.
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