AC 20 then AC 7052 at Vancouver
Singapore → Vancouver → Calgary
Timetable, Vancouver time
07:45AC 20 from Singapore at the gate
12:20AC 7052 to Calgary leaves the gate
4 h 35 apart on the timetable
The last days
AC 20 and AC 7052 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.