my original discussion has gone a bit off track:
BA, Qantas,finnair, etc: no matter what your status if you buy a business or F class ticket and they have a lounge you can use it, international or domestic
AA: if you are international you can. if you are domestic you cannot unless you are either transiting directly off or onto an international.
FF program status and lounge entry is not the issue with reciprocal arrangements that I have. Although I have almost 500K BA miles now I am blue as I dont fly with them enough but do with other OW carriers. as such I would not expect to be let into a lounge if flying econ, I knwo the rules. This is calling a product the same name when the elements are not
we say tomato. they say tomayto etc.