I agree that EZE is surprising, It's tougher for people from Argentina to take leisure trips abroad and business travel in both directions might be down somewhat, but Argentina is currently very attractive for international passengers because the exchange rates are so much in our favor. AFAIK there aren't restrictions on foreign companies taking profits out fo the country.

What would be the other routings to EZE using UA/*A from the USA? Connect through Brazil, or are there still ORD-EZE or SFO-EZE nonstops?

BTW, DL seems to be maintaining the daily ATL-EZE flight. Until a couple years ago, it had been downgauging to a 767 in low season (USA summer) but now it seems to be an A330 year round.

AA offers the most flights, from MIA of course but also other hubs, IIRC at least ORD and IAH.