AA 3538 then AA 535 at Charlotte
Savannah → Charlotte → Chicago O'Hare
Timetable, Charlotte time
14:15AA 3538 from Savannah at the gate
21:12AA 535 to Chicago O'Hare leaves the gate
6 h 57 apart on the timetable
The last days
AA 3538 and AA 535 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.