AA 4504 then DL 1477 at O'Hare
South Bend → Chicago → Atlanta
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
15:59DL 1477 to Atlanta leaves the gate
21 h 24 apart on the timetable, overnight
DL 1477 leaves 21 h 24 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.