The Electronic System for Travel Authorization (ESTA) is an automated system that determines the eligibility of visitors to travel to the United States under the Visa Waiver Program (VWP). ESTA was mandated by the Implementing Recommendations of the 9/11 Commission Act of 2007 for travelers from VWP countries arriving in the U.S. by air or sea.[1] ESTA only authorizes travel to a U.S. airport or port of entry, but admissibility into the United States is determined by a U.S. Customs and Border Protection (CBP) officer upon arrival. The ESTA application collects biographic information and answers to VWP eligibility questions.