when is an esta required for travel
The online form replaces the onboard paper and customs entry requirements for all passport holders of visa waiver countries. Electronic Travel Authorization (ESTA) application forms became mandatory on January 12, 2009, to reinforce security. All travelers on business or holiday, from countries who previously were beneficiaries of the Visa Waiver Program (VWP) must now apply online and obtain an ESTA before their trip to the United States.