UA 571 then AS 580 at San Francisco
Atlanta → San Francisco → Seattle
Timetable, San Francisco time
11:24UA 571 from Atlanta at the gatealso VA 8403, NZ 9005
10:39AS 580 to Seattle leaves the gatealso FI 7656
23 h 15 apart on the timetable, overnight
AS 580 leaves 23 h 15 after UA 571 arrives on the timetable: more than half a day, so not a connection we count.