CA 993 then F8 621 at Toronto Pearson
Beijing → Toronto → Calgary
Timetable, Toronto time
12:10CA 993 from Beijing at the gate
14:45F8 621 to Calgary leaves the gate
2 h 35 apart on the timetable
The last days
CA 993 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.