UA 5721 then BR 643 at O'Hare
Chattanooga → Chicago → Anchorage
Timetable, Chicago time
15:00UA 5721 from Chattanooga at the gate
11:25BR 643 to Anchorage leaves the gate
20 h 25 apart on the timetable, overnight
BR 643 leaves 20 h 25 after UA 5721 arrives on the timetable: more than half a day, so not a connection we count.