This is going to be my last post on this issue.

DL has only three daily nonstop flights between BOS and DFW on Saturdays in November 2025, morning, mid-afternoon and evening. The same for United from IAD to DFW. I am not sure if the mid-afternoon departures are timed to make a connection from an arriving international flight from LIS, factoring in clearing passport control and TSA security.

On the other hand, American has nine daily flights from PHL to DFW on Saturdays in November of next year, four of which depart after the arrival of the LIS flight.