"But Austin is just the start.
As noted in the release, this idea extends to Cincinnati, Cleveland, Columbus (OH), Indianapolis, Memphis, Nashville, and Raleigh/Durham, among others. The increased service by American combined with the rolling back of service by Delta and United puts these in play. We’ve seen bits and pieces of this over the last couple weeks. There is the new Raleigh/Durham – Nashville flight and the Saturday-only flights into Orlando and the Caribbean from some of these very non-hubs. More is coming."
https://crankyflier.com/2021/04/21/amer ... w-flights/
On the fleet topic again, DL and UA used the pandemic to retire some of their fleet earlier than they probably would have. With the smaller fleet size now, DL (or UA) cannot serve all the destinations as well as it did from IND in 2019, market conditions non-withstanding.
Conversely for AA, they have been able to use the AS/B6 partnerships to free up frames in order to serve more new destinations. If AA can effectively hand off some of their west coast flying to AS, and also hand off some BOS/NYC flying to B6, that allows them to move their frames elsewhere and have the capacity in the system to grow IND in a way DL and UA can’t right now.