I normally go to AA Flagship Dining at MIA, probably I have been there 10 times or so. Hardly saw other guests, probably one family and a few couples or similar number of people when 'very busy'. When I asked the staff if the dining could be always deserted, they said that only F passengers to/from London or Sao Paulo (AA members can use miles for the access, but I don't think many redeem) could access, so hardly busy. (FFD at DFW was much busier)

Since the BA lounge has the CCR Dining, probably FFD would be very empty and CCRD full of BA First, GGL and CK?