AC 2405 then AC 422 at Toronto Pearson
Halifax → Toronto → Montréal
Timetable, Toronto time
13:45AC 2405 from Halifax at the gate
19:30AC 422 to Montréal leaves the gate
5 h 45 apart on the timetable
The last days
AC 2405 and AC 422 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.