On AA Platinum and higher flying intl (even in Y) get access to Flagship Lounges but NOT Admirals Clubs. When DL opens FC lounges I wonder what the rules will be?
And
??? If they get access to FL lounge they also can get into Admirals Club (AC) lounges. AA Plats and higher only get access when traveling international or domestic on JFK-LAX/SFO. However its doesnt matter if it's a FL or AC. Oneworld partner elites that are Sapphire or Emerald get access to FL or AC regardless of international/ domestic.
Basically AC is the business lounge if there's no FL at that location. (There's very few FL)