Originally Posted by
Steve M
If you must be on that particular flight, then the best thing to do (aside from hoping that there are cancellations in the meantime that open up seats) is to get to the airport early and hope for the best. There's not much you can do to resolve it before then. They were aware of the oversale situation at the time they did the change of gauge, so bringing this to their attention isn't going to do anything. They can't install more J seats in the aircraft between now and day of departure. And, they're not going to kick someone else that also has confirmed paid J reservations off of the flight or downgrade them to make room for you.
I had this happen on a LAS-DFW that was downgraded from a 772 to a 321. In the case, AA was calling passengers in advance to rebook and offering vouchers as a thank you for those that said yes. This might be happening here too, but a regular reservations agent might not know it's happening. The oversell, if there is one, due to the aircraft change might be mostly if not fully resolved by the time of departure, especially when combining with the inevitable cancellations, misconnects, rebooks, etc.