UA 1057 then BR 643 at O'Hare
Las Vegas → Chicago → Anchorage
Timetable, Chicago time
11:46UA 1057 from Las Vegas at the gate
11:25BR 643 to Anchorage leaves the gate
23 h 39 apart on the timetable, overnight
BR 643 leaves 23 h 39 after UA 1057 arrives on the timetable: more than half a day, so not a connection we count.