AC 1135 then F8 621 at Toronto Pearson
Quebec → Toronto → Calgary
Timetable, Toronto time
13:55AC 1135 from Quebec at the gate
14:45F8 621 to Calgary leaves the gate
50 min apart on the timetable
The last days
AC 1135 and F8 621 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.