AA 5510 then DL 140 at Atlanta
Washington National → Atlanta → Brussels
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
20:40DL 140 to Brussels leaves the gate
21 h 17 apart on the timetable, overnight
DL 140 leaves 21 h 17 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.