UA 4397 then BR 658 at O'Hare
Columbia Metropolitan → Chicago → Toronto Pearson
Timetable, Chicago time
11:59UA 4397 from Columbia Metropolitan at the gate
11:30BR 658 to Toronto Pearson leaves the gate
23 h 31 apart on the timetable, overnight
BR 658 leaves 23 h 31 after UA 4397 arrives on the timetable: more than half a day, so not a connection we count.