AA 4750 then DL 5845 at Philadelphia
Louisville → Philadelphia → Boston
Timetable, Philadelphia time
09:19AA 4750 from Louisville at the gate
09:00DL 5845 to Boston leaves the gate
23 h 41 apart on the timetable, overnight
DL 5845 leaves 23 h 41 after AA 4750 arrives on the timetable: more than half a day, so not a connection we count.