Is this club useful for those of us who fly mostly AA or UA between major domestic hub cities like SFO, ORD, IAD, JFK, LAX, DFW?

From what I can tell, most of the clubs are NW, CO and DL. And these won't do me much good when my flight is leaving from a terminal that is on the other side of the airport.

I also fly a few SWA cities like OAK, BUR, LAS and SAN, but I don't think they have any clubs at these places (though they could sure use a few).

I should probably sign up for the Admirals or Red Carpet, but then I would be shut out when I'm flying the other carrier.