CX 3291 then PD 651 at Toronto Pearson
Chicago O'Hare → Toronto → Las Vegas
Timetable, Toronto time
07:27CX 3291 from Chicago O'Hare at the gate
07:00PD 651 to Las Vegas leaves the gate
23 h 33 apart on the timetable, overnight
PD 651 leaves 23 h 33 after CX 3291 arrives on the timetable: more than half a day, so not a connection we count.