AA 9909 then AA 3544 at O'Hare
South Bend → Chicago → Detroit
Timetable, Chicago time
09:30AA 9909 from South Bend at the gate
13:30AA 3544 to Detroit leaves the gate
4 h apart on the timetable
Today
From the airport’s board at 10:59 Chicago time
09:30AA 9909 is cancelled
13:30AA 3544 due to leave, no estimate yet
The last days
AA 9909 and AA 3544 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.