AA 4931 then BR 643 at O'Hare
Sioux Falls → Chicago → Anchorage
Timetable, Chicago time
14:13AA 4931 from Sioux Falls at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 42 apart on the timetable, overnight
BR 643 leaves 21 h 42 after AA 4931 arrives on the timetable: more than half a day, so not a connection we count.