CV 21 then UA 4576 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
22:27CV 21 from Anchorage at the gate
22:00UA 4576 to St Louis leaves the gate
23 h 33 apart on the timetable, overnight
UA 4576 leaves 23 h 33 after CV 21 arrives on the timetable: more than half a day, so not a connection we count.