DL 543 then DL 1892 at Atlanta
St Louis → Atlanta → Chattanooga
Timetable, Atlanta time
20:10DL 543 from St Louis at the gate
14:30DL 1892 to Chattanooga leaves the gate
18 h 20 apart on the timetable, overnight
DL 1892 leaves 18 h 20 after DL 543 arrives on the timetable: more than half a day, so not a connection we count.