DL 8943 then AC 480 at Toronto Pearson
Philadelphia → Toronto → Montréal
Timetable, Toronto time
23:59DL 8943 from Philadelphia at the gate
06:20AC 480 to Montréal leaves the gate
6 h 21 apart on the timetable, overnight
The last days
DL 8943 and AC 480 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.