UA 751 then DL 3902 at O'Hare
Charlotte → Chicago → Detroit
Timetable, Chicago time
07:25UA 751 from Charlotte at the gate
11:19DL 3902 to Detroit leaves the gate
3 h 54 apart on the timetable
Today
From the airport’s board at 15:45 Chicago time
07:12UA 751 reached the gate13 min early
11:35DL 3902 left the gate16 min late
4 h 23 between the gates
The last days
UA 751 and DL 3902 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.