Miami flagship lounge is available even if you are not flying first class, just need to have status at American to be able to access it. Or you can pay the daily pass on the admiral club. Flagship it's near gates 30 on the D concourse and admiral you have 2 locations on the D concourse aswel.
You need to be a member or flying first class international, or have as citicard black
To access the lounge you must be a member of the admirals club or travel in business class
Thanks! Your answer is awaiting moderation.