AA 640 then AA 5552 at Charlotte
Denver → Charlotte → Knoxville
Timetable, Charlotte time
19:36AA 640 from Denver at the gate
20:35AA 5552 to Knoxville leaves the gate
59 min apart on the timetable
The last days
AA 640 and AA 5552 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.