DL 1199 then AA 9922 at O'Hare
Atlanta → Chicago → Charlotte
Timetable, Chicago time
23:54DL 1199 from Atlanta at the gate
10:00AA 9922 to Charlotte leaves the gate
10 h 06 apart on the timetable, overnight
The last days
DL 1199 and AA 9922 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.