AA 545 then AA 1047 at Philadelphia
Phoenix → Philadelphia → Chicago O'Hare
Timetable, Philadelphia time
05:10AA 545 from Phoenix at the gate
09:21AA 1047 to Chicago O'Hare leaves the gate
4 h 11 apart on the timetable
The last days
AA 545 and AA 1047 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.