F9 1669 then DL 543 at Atlanta
Raleigh-Durham → Atlanta → St Louis
Timetable, Atlanta time
18:06F9 1669 from Raleigh-Durham at the gate
15:45DL 543 to St Louis leaves the gate
21 h 39 apart on the timetable, overnight
DL 543 leaves 21 h 39 after F9 1669 arrives on the timetable: more than half a day, so not a connection we count.