AC 751 then AC 7085 at Montréal
Boston → Montréal → Calgary
Timetable, Montréal time
11:50AC 751 from Boston at the gate
17:21AC 7085 to Calgary leaves the gate
5 h 31 apart on the timetable
The last days
AC 751 and AC 7085 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.