UA 356 then BR 643 at O'Hare
Phoenix → Chicago → Anchorage
Timetable, Chicago time
12:39UA 356 from Phoenix at the gate
11:55BR 643 to Anchorage leaves the gate
23 h 16 apart on the timetable, overnight
BR 643 leaves 23 h 16 after UA 356 arrives on the timetable: more than half a day, so not a connection we count.