I was at PHL on both last Friday and yesterday and thought I would try my luck at the BA lounge. On Friday I was unceremoniously turned away with the excuse being "capacity" and that they were allegedly 10 passengers over the occupancy limit. This was in spite of the lounge being almost empty when I was there (you can see in through the windows from the corridor). Explaining that I was only going to be there for 30 minutes made no difference, nor did citing Oneworld rules.
On Sunday I was told "Yes, no problem," by the same agent, "But can you come back in 10 - 15 minutes please?" to which I said "Yes, of course"
When I went back it was a different agent who told me the lounge was closing imminently as there was only one flight on Sunday and therefore I couldn't come in. Seriously? Why the first agent couldn't have just said that I really don't know.
BA should probably consider having the PHL lounge exclusively for BA passengers and removing the OW entitlement.