AC 523 then OO 301 at O'Hare
Montréal → Chicago → Milwaukee
Timetable, Chicago time
15:00AC 523 from Montréal at the gate
20:19OO 301 to Milwaukee leaves the gate
5 h 19 apart on the timetable
The last days
AC 523 and OO 301 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.