CA 8443 then UA 2226 at O'Hare
Anchorage → Chicago → Buffalo
Timetable, Chicago time
16:59CA 8443 from Anchorage at the gate
14:18UA 2226 to Buffalo leaves the gate
21 h 19 apart on the timetable, overnight
UA 2226 leaves 21 h 19 after CA 8443 arrives on the timetable: more than half a day, so not a connection we count.