AA 3890 then AA 3570 at O'Hare
Sioux Falls → Chicago → Rochester (ROC)
Timetable, Chicago time
16:40AA 3890 from Sioux Falls at the gate
17:15AA 3570 to Rochester (ROC) leaves the gate
35 min apart on the timetable
The last days
AA 3890 and AA 3570 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.