[Butch Cassidy Slept Here]

With regard to international travel: I would always rely in information supplied by the embassies/consulates of the countries in question. As to information provided by an airline: I would follow that ONLY if the airline appears to be under the impression that ADDITIONAL documents are required. For example, the embassy of country X says I only need a valid US passport, but Delta says I need a US passport AND a birth certificate, I would also bring the birth certificate knowing that there is no way I would ever win an argument, as to entry requirements, with Delta, or any other airline.

To second Jim's thoughts: If I lived in Buenos Aires, I'd take my chances with Aerolineas Argentinas, or LAN Chile, even if it meant I had to stay overnight, at my expense, en route, in Miami. Delta probably has made some nasty comments about you on their records by now. So, if you try to fly them again, you'll be walking into a hornet's nest.