DL 1536 then DL 4097 at Atlanta
St Louis → Atlanta → South Bend
Timetable, Atlanta time
09:45DL 1536 from St Louis at the gate
09:10DL 4097 to South Bend leaves the gate
23 h 25 apart on the timetable, overnight
DL 4097 leaves 23 h 25 after DL 1536 arrives on the timetable: more than half a day, so not a connection we count.