B6 8582 then B6 8367 at Boston
Montreal → Boston → New York JFK
Timetable, Boston time
12:03B6 8582 from Montreal at the gate
16:00B6 8367 to New York JFK leaves the gate
3 h 57 apart on the timetable
The last days
B6 8582 and B6 8367 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.