AA 551 then AA 4466 at Philadelphia
Miami → Philadelphia → St Louis
Timetable, Philadelphia time
11:56AA 551 from Miami at the gate
17:40AA 4466 to St Louis leaves the gate
5 h 44 apart on the timetable
The last days
AA 551 and AA 4466 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.