Originally Posted by
NYCBunny
The best part if you're an American, you can fly all around America on AA, rack up Fly-On points and get to use the lounge which their own people can't use for free unless they're EXPlatinum

Actually, only OW Emeralds (AA EXP) get to use the Flagship Lounge on an "international" itinerary, whereas the Admiral's Club is for paid members and OW Sapphires (AA Platinum) on those international itineraries. Fortunately, I am almost always on international segments but the difference between the clubs is quite substantial.