AA 4757 then BR 658 at O'Hare
Pittsburgh → Chicago → Toronto Pearson
Timetable, Chicago time
13:59AA 4757 from Pittsburgh at the gate
11:30BR 658 to Toronto Pearson leaves the gate
21 h 31 apart on the timetable, overnight
BR 658 leaves 21 h 31 after AA 4757 arrives on the timetable: more than half a day, so not a connection we count.