It will eventually apply to all visa-exempt travelers wishing to visit the United Kingdom, including those ... though this policy is currently under review. The ETA system is part of a mission ...
U.S. citizens traveling to the United Kingdom, or even just passing through, will need an Electronic Travel Authorization. It's being called a digital Visa.
The ETIAS system is set for 30 countries in Europe, not including the United Kingdom whose new application is separate. These are technically travel visa waivers attached to a person's passport ...