AC 154 then PD 9921 at Toronto Pearson
Calgary → Toronto → Ottawa
Timetable, Toronto time
22:40AC 154 from Calgary at the gate
07:00PD 9921 to Ottawa leaves the gate
8 h 20 apart on the timetable, overnight
The last days
AC 154 and PD 9921 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.