AA 5510 then DL 865 at Atlanta
Washington National → Atlanta → Boston
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:40DL 865 to Boston leaves the gate
23 h 17 apart on the timetable, overnight
DL 865 leaves 23 h 17 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.