AA 2851 then AA 6256 at O'Hare
Denver → Chicago → Sioux Falls
Timetable, Chicago time
10:30AA 2851 from Denver at the gate
16:47AA 6256 to Sioux Falls leaves the gate
6 h 17 apart on the timetable
The last days
AA 2851 and AA 6256 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.