AA 4504 then DL 2251 at O'Hare
South Bend → Chicago → New York LaGuardia
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
08:45DL 2251 to New York LaGuardia leaves the gate
14 h 10 apart on the timetable, overnight
DL 2251 leaves 14 h 10 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.