The One World web site indicates the LAN lan at MIA is Club America in Concourse E (AA). Other than the AA AC lounge and AA FL lounge in Concourse E I've never seen any other lounge. Does this lounge really exists or would LAN paxs use AA AC/FL lounge.

Since I am connecting from JFK on an AA flight, it would appear that I would need to leave the lounge, go out and check in for my LAN flight, and then need to re-enter Security to get back to the lounge. Sounds like an annoying process. How far in advance can I check in for my LAN flight as I have about 4.5 hours connection time.