DL 609 then DL 4097 at Atlanta
Cancún → Atlanta → South Bend
Timetable, Atlanta time
10:34DL 609 from Cancún at the gate
09:49DL 4097 to South Bend leaves the gate
23 h 15 apart on the timetable, overnight
DL 4097 leaves 23 h 15 after DL 609 arrives on the timetable: more than half a day, so not a connection we count.