AA 4504 then DL 1556 at O'Hare
South Bend → Chicago → Los Angeles
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
07:45DL 1556 to Los Angeles leaves the gate
13 h 10 apart on the timetable, overnight
DL 1556 leaves 13 h 10 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.