AA 4264 then AA 6487 at O'Hare
Sioux Falls → Chicago → St Louis
Timetable, Chicago time
09:02AA 4264 from Sioux Falls at the gate
15:18AA 6487 to St Louis leaves the gate
6 h 16 apart on the timetable
The last days
AA 4264 and AA 6487 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.