PD 9931 then AC 8640 at Montréal
Toronto Pearson → Montréal → New York LaGuardia
Timetable, Montréal time
10:11PD 9931 from Toronto Pearson at the gate
15:20AC 8640 to New York LaGuardia leaves the gate
5 h 09 apart on the timetable
The last days
PD 9931 and AC 8640 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.