UA 571 then UA 643 at San Francisco
Atlanta → San Francisco → Santa Ana
Timetable, San Francisco time
11:24UA 571 from Atlanta at the gatealso VA 8403, NZ 9005
10:32UA 643 to Santa Ana leaves the gatealso AC 4518, VA 8495, NZ 9717
23 h 08 apart on the timetable, overnight
UA 643 leaves 23 h 08 after UA 571 arrives on the timetable: more than half a day, so not a connection we count.