CV 21 then UA 516 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
22:27CV 21 from Anchorage at the gate
20:10UA 516 to St Louis leaves the gate
21 h 43 apart on the timetable, overnight
UA 516 leaves 21 h 43 after CV 21 arrives on the timetable: more than half a day, so not a connection we count.