BR 646 then UA 543 at O'Hare
Anchorage → Chicago → San Francisco
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
10:25UA 543 to San Francisco leaves the gate
17 h 15 apart on the timetable, overnight
UA 543 leaves 17 h 15 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.