AA 4504 then UA 3569 at O'Hare
South Bend → Chicago → Ottawa
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
10:57UA 3569 to Ottawa leaves the gate
16 h 22 apart on the timetable, overnight
UA 3569 leaves 16 h 22 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.