BR 646 then UA 4447 at O'Hare
Anchorage → Chicago → Sioux Falls
Timetable, Chicago time
06:51BR 646 from Anchorage at the gate
21:30UA 4447 to Sioux Falls leaves the gate
14 h 39 apart on the timetable
UA 4447 leaves 14 h 39 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.