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ESTA Updates: Effective January 20, 2010, the Department of Homeland Security is transitioning to enforced compliance of the Electronic System for Travel Authorization (ESTA) requirement for VWP travelers. Therefore, VWP travelers who have not obtained approval through ESTA should expect to be denied boarding on any air carrier bound for the United States.
Beginning 12 January 2009, all nationals and citizens of Visa Waiver Program (VWP) countries who plan to travel to the U.S. for temporary business or pleasure for 90 days or less will be required by law to obtain travel authorization prior to initiating travel to the United States.
For a list of effected countries, see: http://www.travel.state.gov/visa/temp/without/without_1990.html#countries