UA 3922 then AA 6256 at O'Hare
Savannah → Chicago → Sioux Falls
Timetable, Chicago time
02:36UA 3922 from Savannah at the gate
16:47AA 6256 to Sioux Falls leaves the gate
14 h 11 apart on the timetable
AA 6256 leaves 14 h 11 after UA 3922 arrives on the timetable: more than half a day, so not a connection we count.