In some countries that exempt visitors of certain nationalities from the visa requirement, it is always necessary to obtain prior authorization before their arrival by plane. These travel authorizations usually last several years and can be used several times. Airlines must check whether all visa-free passengers have obtained a permit prior to departure, or you must risk fines and costs related to the repatriation of a passenger to their country of origin. The CPI consists of a ranking of passports, based on the number of other areas that can be obtained “visa-free” (defined below). All countries and destination territories in the IATA database are taken into account. However, because not all areas issue passports, there are far fewer passports than targets for asking questions.  Once in the country, the validity of a visa or authorized stay can often be extended at the discretion of the immigration authorities for a fee. Exceeding a temporary stay granted by immigration officers is considered illegal immigration, even if the validity of the visa is not yet complete (i.e. for multiple-entry visas) and a form of “non-status” and the offender may be sanctioned, prosecuted, deported or even reinstated to the blacklist. What is unique is that the Norwegian region of Svalbard is totally visa-free. Some countries – such as those in the Schengen area – have agreements with other countries that allow citizens of the other country to travel to each other without a visa. The World Tourism Organization announced that the number of tourists requiring a visa before travel was at an all-time low in 2015.   Entry into the port of St.
Petersburg with the regular ferry can only take place from the ports of Tallinn (Estonia) or Helsinki (Finland). It is also possible to travel without a visa for 72 hours from the port of Stockholm with the stop in Helsinki.   A service visa issued to foreign citizens is issued using a service passport (consular, official, special). A service visa is issued: to combat visa runs, some countries have limits on how long visitors can pass without a visa in the country, as well as the time they have to stay outside before “resetting the clock”. For example, Schengen countries set a 90-day cap for visitors over a 180-day period. Some countries “don`t back down” when a visitor returns after a visit to a neighbouring country. For example, the United States does not provide new length of stay for visitors when they return from a visit to Canada, Mexico or the Caribbean; instead, they are sent back to the United States for the remaining days they were granted upon their first entry.  Some other countries, z.B. Thailand, allow visitors arriving by land from neighbouring countries to have a shorter length of stay than those arriving by air.