AA 5620 then DL 5845 at Philadelphia
Knoxville → Philadelphia → Boston
Timetable, Philadelphia time
09:47AA 5620 from Knoxville at the gate
09:00DL 5845 to Boston leaves the gate
23 h 13 apart on the timetable, overnight
DL 5845 leaves 23 h 13 after AA 5620 arrives on the timetable: more than half a day, so not a connection we count.