UA 5902 then AA 9951 at O'Hare
Madison → Chicago → Charlotte
Timetable, Chicago time
06:20UA 5902 from Madison at the gate
12:00AA 9951 to Charlotte leaves the gate
5 h 40 apart on the timetable
Today
From the airport’s board at 21:35 Chicago time
05:53UA 5902 reached the gate27 min early
16:53AA 9951 left the gate4 h 53 late
11 h between the gates
The last days
UA 5902 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.