AC 4121 then AM 4496 at San Francisco
Ontario → San Francisco → Atlanta
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
11:44AM 4496 to Atlanta leaves the gate
17 h 54 apart on the timetable, overnight
AM 4496 leaves 17 h 54 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.