adamfd, I don't think you missed anything. We will transfer from AA to TAM in July. Will report results here.

dcpdxtrans , I assume you're talking about the AA lounge. Hoping to use it outbund soon. But won't help OP as far as I can see. No showers in Am Ex lounge. Last time we were there, a month ago, one patron somehow caused the sink in the men's room to crash down, putting the facility out of order. My wife speculated on what he may have been doing, but I won't. Sure wish there were other options for international-to-domestic connections.