AA 4504 then DL 1687 at O'Hare
South Bend → Chicago → Atlanta
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
08:04DL 1687 to Atlanta leaves the gate
13 h 29 apart on the timetable, overnight
DL 1687 leaves 13 h 29 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.