UA 203 then AA 9951 at O'Hare
Kahului → Chicago → Charlotte
Timetable, Chicago time
05:02UA 203 from Kahului at the gate
12:00AA 9951 to Charlotte leaves the gate
6 h 58 apart on the timetable
The last days
UA 203 and AA 9951 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.