AA 2447 then DL 675 at Boston
Washington National → Boston → Kansas City
Timetable, Boston time
08:39AA 2447 from Washington National at the gate
06:10DL 675 to Kansas City leaves the gate
21 h 31 apart on the timetable, overnight
DL 675 leaves 21 h 31 after AA 2447 arrives on the timetable: more than half a day, so not a connection we count.