DL 543 then DL 475 at Atlanta
St Louis → Atlanta → Jackson (Mississippi)
Timetable, Atlanta time
20:28DL 543 from St Louis at the gate
19:30DL 475 to Jackson (Mississippi) leaves the gate
23 h 02 apart on the timetable, overnight
DL 475 leaves 23 h 02 after DL 543 arrives on the timetable: more than half a day, so not a connection we count.