AC 8604 then DL 8922 at Boston
Montréal → Boston → Philadelphia
Timetable, Boston time
09:48AC 8604 from Montréal at the gate
14:00DL 8922 to Philadelphia leaves the gate
4 h 12 apart on the timetable
Boston’s board gives an arrival time for only about 58% of its flights, so many days show no gate time.
The last days
AC 8604 and DL 8922 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.