AC 8909 then AA 4509 at O'Hare
Toronto Pearson → Chicago → Pittsburgh
Timetable, Chicago time
17:43AC 8909 from Toronto Pearson at the gate
18:24AA 4509 to Pittsburgh leaves the gate
41 min apart on the timetable
The last days
AC 8909 and AA 4509 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.