AC 748 then WN 492 at Boston
Montréal → Boston → Denver
Timetable, Boston time
09:48AC 748 from Montréal at the gate
13:10WN 492 to Denver leaves the gate
3 h 22 apart on the timetable
The last days
AC 748 and WN 492 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.