A hypothetical US citizen flies into Amsterdam from NYC, then takes the train to Paris. She then proceeds to take a tourbus for the day to Brussels. She then flies out of CDG back home to NYC
- Is she required to carry her passport at all times on her person in the Schengen boundary?
- If not, when is she required to present the passport, other than entry / exit of the Schengen boundary?
I think that it is important distinguish that although a passport is an ID, the requirement for an ID is not necessarily a requirement for a passport. To make matters even more 'interesting', the US issues a national ID known as a "passport card", which is lacking passport capabilities in that it can not be used for air-travel and in my mind is a national ID and not a passport within the context of this discussion.