AA 712 then AA 1256 at Charlotte
St Louis → Charlotte → Buffalo
Timetable, Charlotte time
10:13AA 712 from St Louis at the gate
16:21AA 1256 to Buffalo leaves the gate
6 h 08 apart on the timetable
The last days
AA 712 and AA 1256 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.