The validity of transit visas for crew members are usually limited to short terms such as several hours to 10 days depending on the size of the country and the circumstances.
An application for a crew visa in advance of arrival may grant non-citizens clearance to enter a country and remain there within specified constraints and regions without prohibiting employment.
This category includes pilots, flight attendants, sailors, and other employees on board a vessel whose services are essential for its normal operation.
Many African countries, including Angola, Benin, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Republic of the Congo, Côte d'Ivoire, Equatorial Guinea, Gabon, Gambia, Ghana, Guinea-Bissau, Kenya, Liberia, Mali, Mauritania, Niger, Rwanda, Senegal, Sierra Leone and Togo, South Sudan, Uganda, and Zambia, require all incoming passengers older than nine months to one year[25] to have a current International Certificate of Vaccination or Prophylaxis, as does the South American territory of French Guiana.
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,[34] 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, India, Indonesia, Iran, Iraq, Israel,[35] Jordan, Kenya, Kiribati, Kuwait, Laos, Madagascar, Malaysia, Marshall Islands, Mongolia, Myanmar, Namibia, Nepal, Nicaragua, Nigeria, Oman, Palau, Papua New Guinea, Peru,[36] Philippines,[37] Qatar, Rwanda, Samoa, Saudi Arabia, Singapore, Solomon Islands, Somalia, Sri Lanka, Sudan, Suriname, Tanzania, Thailand, Timor-Leste, Tokelau, Tonga, Turkey, Tuvalu, Uganda, United Arab Emirates, Vanuatu, Venezuela, and Vietnam.
Countries requiring passports with a validity of at least 3 months beyond the date of intended departure include Azerbaijan, Bosnia and Herzegovina, Honduras, Montenegro, Nauru, Moldova and New Zealand.
Countries that require a passport validity of at least one month beyond the date of intended departure include Eritrea, Hong Kong, Lebanon, Macau, the Maldives[39] and South Africa.
[41] Some countries, including Australia, Canada, Fiji, New Zealand and the United States,[42] routinely deny entry to non-citizens who have a criminal record, while others impose restrictions depending on the type of conviction and the length of the sentence.
[69][70] The United States Department of Homeland Security has announced plans to greatly increase the biometric data it collects at US borders.