The LAN lounge, during non-peak hours, is a quite pleasant place to hang out. Food offerings are so-so, there's a freezer with ice cream, wine selection is pretty good. It just gets too overcrowded as a (temporary) shared lounge with AA in the evenings. That said, even if you want to spend a lot of "lounge time," AA probably doesn't open until 4:30 to 5:00, and I'd suggest a decent lunch prior to heading out that way, NO EARLIER THAN 4PM.