CA 8443 then UA 5790 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
16:59CA 8443 from Anchorage at the gate
13:00UA 5790 to St Louis leaves the gate
20 h 01 apart on the timetable, overnight
UA 5790 leaves 20 h 01 after CA 8443 arrives on the timetable: more than half a day, so not a connection we count.