AA 5050 then AA 9950 at Philadelphia
Atlanta → Philadelphia → Chicago O'Hare
Timetable, Philadelphia time
12:10AA 5050 from Atlanta at the gate
13:01AA 9950 to Chicago O'Hare leaves the gate
51 min apart on the timetable
The last days
AA 5050 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.