AA 4604 then AA 5124 at Philadelphia
St Louis → Philadelphia → Pittsburgh
Timetable, Philadelphia time
09:20AA 4604 from St Louis at the gate
16:00AA 5124 to Pittsburgh leaves the gate
6 h 40 apart on the timetable
The last days
AA 4604 and AA 5124 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.