WS 2557 then AC 137 at Toronto Pearson
Cancún → Toronto → Calgary
Timetable, Toronto time
01:15WS 2557 from Cancún at the gate
09:55AC 137 to Calgary leaves the gate
8 h 40 apart on the timetable
The last days
WS 2557 and AC 137 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.