AA 5510 then WN 4816 at Atlanta
Washington National → Atlanta → St Louis
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
20:15WN 4816 to St Louis leaves the gate
20 h 52 apart on the timetable, overnight
WN 4816 leaves 20 h 52 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.