AA 5510 then DL 1199 at Atlanta
Washington National → Atlanta → Chicago O'Hare
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:40DL 1199 to Chicago O'Hare leaves the gate
23 h 17 apart on the timetable, overnight
DL 1199 leaves 23 h 17 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.