Very minor correction: you can use the US Clubs in PHL A-West (the largest), B/C (it's one large club above the B-C connector walkway, rather than one in each of the B and C terminals), and F, and the AA Admirals Club in A-East, though that one is pretty small. My suggestion would be the A-East or B/C Clubs, whichever is closer to your gate. PHL-LAX will not depart from Terminal F, so no need to go over there.