AC 3155 then AC 3966 at Newark
Quebec → New York → Chicago
Timetable, New York time
14:48AC 3155 from Quebec at the gatealso UA 3568, AC 4538
15:30AC 3966 to Chicago leaves the gate
42 min apart on the timetable
The last days
AC 3155 and AC 3966 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.