Originally Posted by
cmn.jcs
I was surprised too. Oddly enough, the itinerary is an AA-numbered flight operated by AS, connecting to an AS flight. Not sure how AA got in the mix.
That is pretty typical - they will rebook on the next available flight in most cases, regardless of airline.
If there are *A flights departing sooner you're more likely to end up on one of them but very common to see OAL rebookings like this.