AC 4121 then SK 3638 at San Francisco
Ontario → San Francisco → Los Angeles
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gatealso UA 5483
16:30SK 3638 to Los Angeles leaves the gate
22 h 40 apart on the timetable, overnight
SK 3638 leaves 22 h 40 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.