UA 12 then BR 643 at O'Hare
Zurich → Chicago → Anchorage
Timetable, Chicago time
12:40UA 12 from Zurich at the gate
11:55BR 643 to Anchorage leaves the gate
23 h 15 apart on the timetable, overnight
BR 643 leaves 23 h 15 after UA 12 arrives on the timetable: more than half a day, so not a connection we count.