Its a pretty quiet time for wide body now - seasonal europe has mostly stopped while south america hasn't fully ramped up yet. Also before thanksgiving is a slow time for air travel so there should in general be some slack in the fleet

If AA has a good optimization tool, they could probably just up-size aircrafts to maintain the same capacity with slightly reduced frequency. i.e. to fly more wide body from hub to hub, freeing up some A321 to replace 738 on high frequency hub-to-spoke flights. And 738 to replace A319 which replaces E75/CR9, and so on.

DCA is a prime example of this: the airport is so congested ATC-wise, but 1/3 to half of AA's operations are RJs. For example... instead of flying 6 CRJ/E75 from DCA to ATL they can fly something like 5 A319 - which reduces 17% of ATC movements while maintaining about the same level of capacity.