AC 4121 then AC 4309 at San Francisco
Ontario → San Francisco → Santa Ana
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
15:05AC 4309 to Santa Ana leaves the gatealso AS 4631, UA 4631, VA 8494
21 h 15 apart on the timetable, overnight
AC 4309 leaves 21 h 15 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.