AA 4504 then DL 2894 at O'Hare
South Bend → Chicago → Atlanta
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
13:30DL 2894 to Atlanta leaves the gate
18 h 55 apart on the timetable, overnight
DL 2894 leaves 18 h 55 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.