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).
I've always thought their protection works by having the inbound carrier take responsibility, ie if BA is late and you miss the connection to AA/US, they expect BA to handle it.