Tourists can enter USA by train or car if coming from Canada or Mexico , as there are more than 150 land ports. Tourists can also reach the country by plane from practically anywhere in the world. There are over 100 international airports that cater to millions of tourists that enter the country every day. Over 14,000 other airports support these international airports. According to the Bureau of Transportation Statistics, the busiest international airports are the John F. Kennedy International Airport in New York City , the Los Angeles Airport in California , the Miami International Airport in Florida , and the O'Hare International Airport in Chicago.
The US government always requires visas from tourists, except for those who come from 27 countries that have the visa waiver program. These countries are Andorra , Australia , Austria , Belgium , Brunei , Denmark , Finland , France , Germany , Iceland , Ireland , Italy , Japan , Liechtenstein , Luxembourg , Monaco , Netherlands , New Zealand , Norway , Portugal , San Marino , Singapore , Slovenia , Spain , Sweden , Switzerland , and the United Kingdom . For visitors from other countries, US visas can be obtained from any of the 301 US embassies and consulates all over the world.
