Someone with AA status will be better placed to answer this (I'm QF Platinum), however I don't believe being on a QF ticket makes any difference. My understanding is that AA status passengers can only access the lounges when flying domestically if they purchase an AAdmirals Club membership (30 day memberships are available for purchase). This rule only applies in the US on domestic flights – for International flights departing a US port, AA status passengers have lounge access.