Originally Posted by BenjaminNYC
Sorry, but I think you're really confused about the AA system. AA only has three routes domestically which are three class service. JFK-LAX, JFK-SFO (about 50% of the time three-class) and JFK-MIA (1 or 2 flights a day three-class). On these routes, ANYONE can upgrade from a Business fare to First, you don't need to be EXP. In fact, your EXP free upgrades will NOT work to upgade you from J->F on these routes, and 500-miler stickers won't do so either for Plats and Golds. You, or anyone else, needs to use miles. Other than these few routes and flights, there is no domestic Business Class on AA.
AA gives EXP's some SWU's each year. These certificates are, IMO, more valuable on international flights, but they are system-wide. EXP's also get waitlist priority from business to first if the seat isn't available. There are definite advantages to being EXP when flying on a domestic, three-cabin aircraft.