It is possible that that new AA MIA > EIS flight will not be available in the Fall. It is supposedly only seasonal until they determine the long-term viability of the route.
As currently scheduled that AA flight to EIS departs MIA at 10:27 AM. That would require either a redeye out of PHX or an overnight in MIA. Of course, with this being a new service, AA may alter the schedule as gather more data.
The AA flight (MIA - EIS) is showing up in Google flights re-starting November 16, 2023.