I only know of one lounge there - it is a shared lounge, which since LAN uses it, I imagine it is the same one AA uses. You will get an invitiation at check-in. It is a perfectly ok lounge - one caveat - I ordered a drink, and when I ordered the 2d one, I was asked to pay, and told that guests only receive 1 complimentary drink. No one tells you this until you order the next drink. LIM has a new airport, which even if you had to wait w/o lounge in the general area is about 10000% better than what was there a few years ago - the airport was a certified 3d world pit. Now, it is a pleasant place.