AC 748 then UA 1783 at Boston
Montréal → Boston → Washington
Timetable, Boston time
09:48AC 748 from Montréal at the gate
18:00UA 1783 to Washington leaves the gate
8 h 12 apart on the timetable
The last days
AC 748 and UA 1783 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.