Originally Posted by
chicagoflyer1976
If one says they have booked J, and gives the route they are flying, the experienced flyer will know whether or not that's sold as first class or business class.
And quite frankly who cares whether AA have marketed their short haul J cabin as First Class or Business Class depending on whether the destination happens to be domestic or international. Nowadays I would say that by far the most common usage of F is to denote a First Class cabin where a Business Class (J class) cabin also exists.