AA 5274 then DL 5714 at Philadelphia
Knoxville → Philadelphia → Boston
Timetable, Philadelphia time
20:05AA 5274 from Knoxville at the gate
19:55DL 5714 to Boston leaves the gate
23 h 50 apart on the timetable, overnight
DL 5714 leaves 23 h 50 after AA 5274 arrives on the timetable: more than half a day, so not a connection we count.