AA 1716 then AA 2188 at Miami
St Louis → Miami → Philadelphia
Timetable, Miami time
08:49AA 1716 from St Louis at the gate
17:39AA 2188 to Philadelphia leaves the gate
8 h 50 apart on the timetable
The last days
AA 1716 and AA 2188 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.