Prior Permission
Even if you had an ESTA before, you must obtain a new one if your passport, name, gender, or country of citizenship changes, or if your previous ESTA expires.
 Restrictions Following Overstay
If you have previously overstayed your VWP visa, you may be prohibited from using the programme in the future.
 Carrier Limitations
You must reach via a VWP-approved carrier, which includes the majority of air and sea carriers.
 Islands adjacent to Canada and Mexico
Generally, travel to adjacent islands, Canada, or Mexico is permitted, but complications may arise if your 90-day period expires during your stay. Customs and Border Protection of the United States should be consulted for clarification.
 Evidence of Continued Travel
You may be required to provide documentation of subsequent travel or other arrangements to depart the United States within 90 days.
 Biometric Information Obligation
You will be required to provide biometric information, such as fingerprints and photographs, upon arrival.
 Updates to ESTA
Minor itinerary adjustments do not necessitate a new ESTA application, but significant changes such as a change in departure or arrival city in the United States may require a new application.
The ESTA regulations impose limits on travelers for the objectives of ensuring visits do not pose as security or economic hazards to U.S. citizens or permanent residents. Regardless of these rules, ESTA continues as a flexible and easy travel permission that provides nearly as much usefulness as a U S visa, with much less stress to obtain.
Always review the most recent standards and restrictions, since regulations might change after my latest update. Failure to adhere to these rules can result in immediate deportation and may affect future travel to the US.