UA 2091 then BR 643 at O'Hare
San Francisco → Chicago → Anchorage
Timetable, Chicago time
12:59UA 2091 from San Francisco at the gate
11:55BR 643 to Anchorage leaves the gate
22 h 56 apart on the timetable, overnight
BR 643 leaves 22 h 56 after UA 2091 arrives on the timetable: more than half a day, so not a connection we count.