Originally Posted by
Marambio
I have an Argentine and a EU passport, the latter I use when travelling to the US and Europe.
When checking-in in Europe/USA on flights to EZE I have been many times asked to produce my Argentine passport, presumably because I didn’t have a flight out of Argentina on the same booking.
Interesting - I know that I've booked my USA-Argentina-USA trips on separate tickets in the past, just don't recall being asked. However, I think I might need to book some form of refundable travel departing Argentina to be on the safe side, otherwise I might have problems at the airport.