AA 1803 then DL 5714 at Philadelphia
Jacksonville → Philadelphia → Boston
Timetable, Philadelphia time
20:05AA 1803 from Jacksonville 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 1803 arrives on the timetable: more than half a day, so not a connection we count.