I've got a somewhat related question.
I have a 20-segment, AA-ticketed, ex-CPT, DONE5 departing next April. We'll need to switch OZ/NZ for North America in the middle of the trip (already looked into changing upfront and it didn't seem worth the cost). Our options to make the change look to be MAD or SCL. Any experience with either location?
Right now, we've got an 8 hour layover in MAD (4PM-12AM), and several days in SCL.

Only other alternative would be to try and do something during a 5 hour layover in LHR, but it would mean schlepping between T5 and T3.