Originally Posted by
Boleslav
Vida - I am not sure that I agree with your statement:
"For the return, use your EU passport to board and the US passport to enter the US and for any connected paperwork to fill out on board the aircraft that is for entry. "
I think that I should board with my US passport, as the airline has to ensure that I have either visa, green card or am a citizen to enter US.
Etoile - thank you, we just got the US passports, so all this dual thing is very new to me and yes, I am nervous not to make a mistake
I don't think you can "make a mistake" as long as you have valid passports from both US and EU to show.
Brazilians, for example, even those with US citizenship and passport, have to enter and leave Brazil on a Brazilian passport. (Passport control on exit from Brazil understands this, where you seem to think Bolivian passport control may not. Etoile's post about his exit from Argentina also confirms my thinking though.) I think you must exit the country, in this case Bolivia, with the same passport you entered on. But the passenger is also required to show the US passport to confirm to the airline (that is responsible for returning you to your point of departure at their own expense if you cannot enter the US), not exiting passenger passport control of Bolivia, that they can legally enter the US (and don't need a visa).