AA 3815 then DL 2646 at O'Hare
Hartford → Chicago → Boston
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
16:40DL 2646 to Boston leaves the gate
20 h 25 apart on the timetable, overnight
DL 2646 leaves 20 h 25 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.