AA 5089 then AA 9954 at Philadelphia
St Louis → Philadelphia → Atlanta
Timetable, Philadelphia time
09:19AA 5089 from St Louis at the gate
15:30AA 9954 to Atlanta leaves the gate
6 h 11 apart on the timetable
The last days
AA 5089 and AA 9954 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.