AA 1997 then AA 5004 at O'Hare
St Louis → Chicago → Detroit
Timetable, Chicago time
09:00AA 1997 from St Louis at the gate
19:00AA 5004 to Detroit leaves the gate
10 h apart on the timetable
The last days
AA 1997 and AA 5004 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.