AA 712 then AA 6102 at Charlotte
St Louis → Charlotte → Harrisburg
Timetable, Charlotte time
10:13AA 712 from St Louis at the gate
13:15AA 6102 to Harrisburg leaves the gate
3 h 02 apart on the timetable
The last days
AA 712 and AA 6102 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.