ET 552 then PD 651 at Toronto Pearson
Addis Ababa → Toronto → Las Vegas
Timetable, Toronto time
08:15ET 552 from Addis Ababa at the gate
07:00PD 651 to Las Vegas leaves the gate
22 h 45 apart on the timetable, overnight
PD 651 leaves 22 h 45 after ET 552 arrives on the timetable: more than half a day, so not a connection we count.