AA 4511 then AA 9950 at Philadelphia
Nashville → Philadelphia → Chicago O'Hare
Timetable, Philadelphia time
09:12AA 4511 from Nashville at the gate
13:01AA 9950 to Chicago O'Hare leaves the gate
3 h 49 apart on the timetable
The last days
AA 4511 and AA 9950 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.