AA 9909 then DL 3902 at O'Hare
South Bend → Chicago → Detroit
Timetable, Chicago time
09:30AA 9909 from South Bend at the gate
11:19DL 3902 to Detroit leaves the gate
1 h 49 apart on the timetable
Today
From the airport’s board at 10:59 Chicago time
09:30AA 9909 is cancelled
11:19DL 3902 due to leave, no estimate yet
The last days
AA 9909 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.