In most cases, ESTA provides an almost immediate determination of eligibility for travel under the VWP. There are three types of responses to an ESTA application: Authorization Approved, Authorization Pending and Travel Not Authorized. Applicants who receive an approval are authorized to travel to the United States under the VWP. Applicants who receive an Authorization Pending response will need to check the website for updates within 72 hours to receive a final response. Applicants whose ESTA applications are denied will be referred to the Travel Information web site for information on how to apply for a visa to travel to the United States.