Thanks a lot for all the suggestions and reply. As in my first posting, we two want to visit Peru and Brazil in the month of July. I checked the award flights in AA site. I can get business class from sfo to lim for 30k and another 30k back. But economy is showing 35k each leg and is available any day. Only drawback with business fare is long flight with 3 stopover(19 to 26 hrs total time). Even though I checked the box for AA and partner airlines, it only shows AA flights. Nothing about LAN flights from SFO or LAX.

I also did multi city reservation, but that is extra 20k miles because SFO to Brazil is different zone. It is true that LIM to GRU is expensive. Our main idea for visiting Brazil is to see Iguazu falls and Sao Paulo. The LAN flight has stop in San tiago, Chile. Thinking of getting a free stopover at Santiago to visit look around Chile.(since this is a paid ticket, not through award, or is it possible to have award stopover?).

so our trip looks like this..

July departure

SFO - LIM - SAO or Iguazu (via Santiago. maybe stopover for two to three days)- SFO.

Or

SFO - SAO - (Iguazu) - Santiago - LIM - SFO

thanks
Swamy