I'm flying to Paraguay later this week. (I too miss the all-AA itineraries via GRU.) My itinerary entails AA to and from SCL with a connection there to a LAN code share flight operated by Paraguay's TAM Mercosur. At least it is all on one ticket (I assume I'm protected in case of a misconnect) and I was able to book it on aa.com piecing it together with the Price & Schedule option. Longer layovers than I'd like in SCL coming and going, but at least there's an Admiral's Club there.