DL 2646 then AA 4715 at Boston
Chicago O'Hare → Boston → Harrisburg
Timetable, Boston time
23:08DL 2646 from Chicago O'Hare at the gate
22:00AA 4715 to Harrisburg leaves the gate
22 h 52 apart on the timetable, overnight
AA 4715 leaves 22 h 52 after DL 2646 arrives on the timetable: more than half a day, so not a connection we count.