AA 4604 then AA 2944 at Philadelphia
St Louis → Philadelphia → Los Angeles
Timetable, Philadelphia time
09:20AA 4604 from St Louis at the gate
13:00AA 2944 to Los Angeles leaves the gate
3 h 40 apart on the timetable
The last days
AA 4604 and AA 2944 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.