AC 763 then PD 651 at Toronto Pearson
Boston → Toronto → Las Vegas
Timetable, Toronto time
07:50AC 763 from Boston at the gate
07:00PD 651 to Las Vegas leaves the gate
23 h 10 apart on the timetable, overnight
PD 651 leaves 23 h 10 after AC 763 arrives on the timetable: more than half a day, so not a connection we count.