Originally Posted by
TravellingSalesman
I don't know if this also applies to US bookings, but AA protects oneworld->AA 'connections', even on separate tickets...
(ETA: I would really hope it does, given they're now a single airline and all).
Unofficially they do. And the last US flight is on (approx) 17 October, so the OP is on one of the last services. I've also found PHL a breeze to get through, but of course you never can be sure how many aircraft come in 20 minutes before your service. I'd be happy to take this connection, albeit as hand baggage only.