Originally Posted by
Eastbay1K
The trip to MDZ is much easier via SCL - an easy int'l/int'l connection @ SCL, 30 minutes airtime, and then your Argentina point of entry is MDZ, much easier than EZE - plus then requiring (likely) a cross-town transit. Recall also now that if you interline on separate tickets, you might need to retrieve your bags enroute.
Although award space has gotten pretty dicey on the route, nothing is better (for me, anyway) than the SFO/LIM route to get to deep South America. It sounds like getting something in an AA bank (and maybe they'll comp you some status) would be the best way for your travels. It will permit you to get there on one ticket for one set mileage amount.
Nothing will make you appreciate the SFO/LIM route more than your return flight, when you land at SFO in the AM, and are home, no TSA to deal with, and a calm and generally uncrowded arrivals process (often the only flight at that hour).