AC 154 then PD 9931 at Toronto Pearson
Calgary → Toronto → Montréal
Timetable, Toronto time
22:40AC 154 from Calgary at the gate
09:00PD 9931 to Montréal leaves the gate
10 h 20 apart on the timetable, overnight
The last days
AC 154 and PD 9931 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.