Traveling to the United States usually requires prior visa processing. However, there are exceptional situations and special programs that allow entry into the country without a visa, although they often impose additional requirements on travelers.
One of the most well-known ways to travel to the U.S. without a visa is by participating in the Visa Waiver Program (VWP). This program allows citizens of 39 countries to enter the U.S. for tourism or business purposes for up to 90 days without needing to obtain a visa. However, this requires obtaining permission through the Electronic System for Travel Authorization (ESTA).
Nonetheless, participation in the VWP and obtaining ESTA approval do not guarantee that you will be boarded on a plane without additional checks. Your documents and permissions will be carefully scrutinized during check-in for the flight, and the final decision on entry is made by the U.S. border services upon arrival.
There are also other categories of people who may be allowed to enter the U.S. without a visa. For example, citizens of Canada and Bermuda may enter the U.S. without a visa for a short period (usually up to 180 days) for tourism or business trips. Some categories of travelers, such as children under 16 and people over 65 who are citizens of Canada or Bermuda, may even cross the border by presenting only an identity document proving citizenship, such as a passport.
Moreover, there is a special category of transit visas for transit passengers crossing U.S. territory. However, if you have the opportunity to go through transit control at the airport and not leave the international zone, a visa may not be necessary. This is known as TWOV (Transit Without Visa) and operates in some American airports. But this requires compliance with a number of conditions, and not all airlines offer this option.
It should be noted that each airline may have its own rules and requirements regarding the transportation of passengers without a U.S. visa. Therefore, before planning a trip, it is strongly recommended to clarify all the details related to documents and permissions in advance.
In general, entry into the U.S. without a visa is possible but subject to strict rules and conditions. Visa-free travel is usually only possible for short-term tourist or business trips and requires prior electronic approvals and thorough checks. Each case is individual, and it is important to carefully study all requirements and restrictions before traveling.