AA 2129 then AA 3189 at Philadelphia
Miami → Philadelphia → Chicago O'Hare
Timetable, Philadelphia time
09:45AA 2129 from Miami at the gate
18:37AA 3189 to Chicago O'Hare leaves the gate
8 h 52 apart on the timetable
The last days
AA 2129 and AA 3189 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.