AA 4504 then DL 1578 at O'Hare
South Bend → Chicago → Minneapolis
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:59DL 1578 to Minneapolis leaves the gate
15 h 24 apart on the timetable, overnight
DL 1578 leaves 15 h 24 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.