AA 4504 then AA 1252 at Philadelphia
Chicago O'Hare → Philadelphia → Miami
Timetable, Philadelphia time
23:23AA 4504 from Chicago O'Hare at the gate
06:00AA 1252 to Miami leaves the gate
6 h 37 apart on the timetable, overnight
The last days
AA 4504 and AA 1252 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.