UA 5977 then BR 643 at O'Hare
Roanoke → Chicago → Anchorage
Timetable, Chicago time
15:10UA 5977 from Roanoke at the gate
14:50BR 643 to Anchorage leaves the gate
23 h 40 apart on the timetable, overnight
BR 643 leaves 23 h 40 after UA 5977 arrives on the timetable: more than half a day, so not a connection we count.