AA 978 then AA 640 at Charlotte
Memphis → Charlotte → Denver
Timetable, Charlotte time
08:04AA 978 from Memphis at the gate
11:40AA 640 to Denver leaves the gate
3 h 36 apart on the timetable
The last days
AA 978 and AA 640 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.