AA 4504 then DL 1178 at O'Hare
South Bend → Chicago → Atlanta
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:51DL 1178 to Atlanta leaves the gate
15 h 16 apart on the timetable, overnight
DL 1178 leaves 15 h 16 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.