US and EU passport holders, how do you go into/out of the US and the EU?

Which passport do you use for the US check-in agents, at the gate, in Europe at passport control, check-in, emmigration, and at US immigration?

Answer:
Dual citizenship - and dual passports - is an extremely common phenomenon.

US law says that citizens must use their US passports to enter and leave the US. While most other countries have the same requirement, if you enter another country using that country's passport, if you get into trouble the US embassy will probably not be able to help you. If you're a citizen of an EU country, that is probably not going to be a problem, but it's still something to keep in mind.
It would be unusual to hold two passports -- it would require dual citizenship, as well as having spent money for a second passport, which one really doesn't need and they are not cheap. My US passport got me into Germany one day, no visa required.
Simple I use the shortest line but it best always to use the passport of the country you entering

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