South America - Rio De Janiro GIG Arrival Lounges?

I am arriving in GIG this week and need to wait at the airport for another friend to arrive an hour after me in a different flight. here are my questions:

1. I am arriving on an American Airlines flight so which terminal will I be arriving into?

2. I have both an Amex platinum card and Priority Pass so which lounge would it be best for me to go in? (I would like a shower if possible as well.)

Thanks so much guys.

Levi