UA 868 then BR 643 at O'Hare
Tokyo Narita → Chicago → Anchorage
Timetable, Chicago time
14:50UA 868 from Tokyo Narita at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 05 apart on the timetable, overnight
BR 643 leaves 21 h 05 after UA 868 arrives on the timetable: more than half a day, so not a connection we count.