AA 3664 then AA 9786 at O'Hare
Buffalo → Chicago → Philadelphia
Timetable, Chicago time
12:29AA 3664 from Buffalo at the gate
17:30AA 9786 to Philadelphia leaves the gate
5 h 01 apart on the timetable
The last days
AA 3664 and AA 9786 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.