The crossword solution for the term IS, IN AVILA is ESTA. ESTA stands for Electronic System for Travel Authorization and is a program run by the United States Customs and Border Protection (CBP). It is used to determine the eligibility of visitors to travel to the United States under the Visa Waiver Program (VWP). ESTA is an online application that must be completed prior to travel to the United States and is valid for two years or until the traveler's passport expires, whichever comes first. ESTA is required for all travelers from VWP countries who are entering the United States by air or sea.