AA 3977 then AA 1297 at Detroit
Chicago O'Hare → Detroit → Charlotte
Timetable, Detroit time
13:00AA 3977 from Chicago O'Hare at the gate
19:42AA 1297 to Charlotte leaves the gate
6 h 42 apart on the timetable
The last days
AA 3977 and AA 1297 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.