AA 2447 then DL 5601 at Boston
Washington National → Boston → Cincinnati
Timetable, Boston time
08:39AA 2447 from Washington National at the gate
08:25DL 5601 to Cincinnati leaves the gate
23 h 46 apart on the timetable, overnight
DL 5601 leaves 23 h 46 after AA 2447 arrives on the timetable: more than half a day, so not a connection we count.