Originally Posted by
linglingfool
Sorry, to clarify: I was asking about the dedicated check-in channel that funnels pax directly into the lounge, not about actually accessing the lounge once airside.
You can use the immigration counter at the second floor after the LATAM priority check in just before the lounge, this is not restricted for use by LATAM elites/business passengers, just go straight when you get to LATAM preferred check in area; AA check in is downstairs though.