AA 1848 then DL 5714 at Philadelphia
Chicago O'Hare → Philadelphia → Boston
Timetable, Philadelphia time
20:10AA 1848 from Chicago O'Hare at the gate
19:55DL 5714 to Boston leaves the gate
23 h 45 apart on the timetable, overnight
DL 5714 leaves 23 h 45 after AA 1848 arrives on the timetable: more than half a day, so not a connection we count.