My wife has both US and Swedish passports and we're taking a short trip to Brazil. I understand that she does not need a visa to enter Brazil if she enters as a Swede, however our concern is which passport should she show when LEAVING the US ? If she shows the American passport, they will probably ask her for her Visa. Does she then show her Swedish one? Or should she show the Swedish in the first place? If so, won't the airline ask her about her I-94 (or something like that) and she'll be forced to show the US passport?

LOTS OF QUESTIONS !!

Could somebody help us out?

Thanks a lot !