AA 5510 then DL 200 at Atlanta
Washington National → Atlanta → Johannesburg
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:05DL 200 to Johannesburg leaves the gate
21 h 42 apart on the timetable, overnight
DL 200 leaves 21 h 42 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.