AA 545 then AA 1739 at Philadelphia
Phoenix → Philadelphia → St Louis
Timetable, Philadelphia time
05:10AA 545 from Phoenix at the gate
08:56AA 1739 to St Louis leaves the gate
3 h 46 apart on the timetable
The last days
AA 545 and AA 1739 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.