WN 1668 then DL 2020 at Atlanta
St Louis → Atlanta → Oklahoma City
Timetable, Atlanta time
12:30WN 1668 from St Louis at the gate
11:20DL 2020 to Oklahoma City leaves the gate
22 h 50 apart on the timetable, overnight
DL 2020 leaves 22 h 50 after WN 1668 arrives on the timetable: more than half a day, so not a connection we count.