DL 5164 then AA 320 at O'Hare
Detroit → Chicago → Philadelphia
Timetable, Chicago time
07:41DL 5164 from Detroit at the gate
08:30AA 320 to Philadelphia leaves the gate
49 min apart on the timetable
The last days
DL 5164 and AA 320 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.