AA 2442 then AA 2576 at Charlotte
Buffalo → Charlotte → Chicago O'Hare
Timetable, Charlotte time
17:57AA 2442 from Buffalo at the gate
18:40AA 2576 to Chicago O'Hare leaves the gate
43 min apart on the timetable
The last days
AA 2442 and AA 2576 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.