AA 4504 then UA 3674 at O'Hare
South Bend → Chicago → Toronto Pearson
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
11:05UA 3674 to Toronto Pearson leaves the gate
16 h 30 apart on the timetable, overnight
UA 3674 leaves 16 h 30 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.