To me PHL is just not that great as a TATL connecting point with AA. No Flagship Lounge, so you don't get the full experience with AA. OTOH, I can make use of the AMEX Centurion Lounge, but that's not thanks to the airline. But I guess it makes sense to focus all the oddball TATL routes at one Eastcoast airport. Taken that there's no AB and it's going to continue that there's a hole in OW in terms of the coverage in Continental Europe, AA will hopefully tap as much as possible to that market area. PRG and BUD are not directly that market, but some nice additions besides the German destinations. WAW or CPH could be interesting.