UA 2124 then BR 643 at O'Hare
Houston → Chicago → Anchorage
Timetable, Chicago time
12:45UA 2124 from Houston at the gate
11:55BR 643 to Anchorage leaves the gate
23 h 10 apart on the timetable, overnight
BR 643 leaves 23 h 10 after UA 2124 arrives on the timetable: more than half a day, so not a connection we count.