Originally Posted by
Yaatri
As others have pointed out that no US citizens need no visa for visiting Western Europe as long as the visit is less than 90 days. As a matter of practice, it's a good idea to look into visa requirements in advance as in some cases visa cannot be obtained in a short time. There was a time in the 80's when the US citizens were required to get a visa to France.
The US is the glaring exception to this but most of the time, one does not require even a transit visa if not leaving the airport. Even citizens who need visas to Schengen countries (for example) sometimes do not need transit visas, such as South African citiznes, but others (mostly the poorest of the poor countries out there) do.