Visas

New U.S. Government Entry Requirement for Visa Waiver Program (VWP) Countries
Effective 20 January 2011 citizens of Visa Waiver countries will be unable to enter the United States without Electronic System for Travel Authorization (ESTA) approval from the U.S. Government. VWP travelers who have not obtained approval through ESTA will be denied boarding on any air carrier destined for the United States. For more information, visit the VWP program website.

Visa applicants from many countries must now apply 3–4 months in advance of their travel date. The U.S. Department of State maintains a comprehensive website containing information about traveling to the United States.

The National Academies website has additional information about visa-related issues and travel information for U.S. citizens and non-U.S. citizens.