AC 750 then B6 9003 at Boston
Montréal → Boston → New York JFK
Timetable, Boston time
14:43AC 750 from Montréal at the gate
20:25B6 9003 to New York JFK leaves the gate
5 h 42 apart on the timetable
The last days
AC 750 and B6 9003 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.