AC 4121 then AS 523 at San Francisco
Ontario → San Francisco → Santa Ana
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
16:17AS 523 to Santa Ana leaves the gatealso QR 2120, QR 8882, AA 9343
22 h 27 apart on the timetable, overnight
AS 523 leaves 22 h 27 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.