CV 12 then UA 4572 at O'Hare
Anchorage → Chicago → Sioux Falls
Timetable, Chicago time
19:11CV 12 from Anchorage at the gate
12:29UA 4572 to Sioux Falls leaves the gate
17 h 18 apart on the timetable, overnight
UA 4572 leaves 17 h 18 after CV 12 arrives on the timetable: more than half a day, so not a connection we count.