AA 1187 then BR 658 at O'Hare
Las Vegas → Chicago → Toronto Pearson
Timetable, Chicago time
11:52AA 1187 from Las Vegas at the gate
11:30BR 658 to Toronto Pearson leaves the gate
23 h 38 apart on the timetable, overnight
BR 658 leaves 23 h 38 after AA 1187 arrives on the timetable: more than half a day, so not a connection we count.