I'm actually in IGU right now flying on last round's ticket. I flew LAX-(LIM)-SCL-EZE--GIG-IGU-LIM-LAX for a little over $600. Spent a week in Argentina and 2.5 days at Iguacu. Awesome vacation and I'd do it again if I could get anything to price from LAX. This time I would stopover in GIG or LIM. Alas...
Got full credit for LAX-SCL on AA. Had a gate agent change SCL-EZE to my AS number but of course it didn't stick and I got 25% credit on AA. Sad. Put in my AS number during OLCI for the return so we will see if IGU-LIM actually goes to the right place this time.
Thanks for posting and wish I could use it again.