UA 3926 then AC 4470 at San Francisco
Newark → San Francisco → Ontario
Timetable, San Francisco time
22:56UA 3926 from Newark at the gate
14:00AC 4470 to Ontario leaves the gate
15 h 04 apart on the timetable, overnight
AC 4470 leaves 15 h 04 after UA 3926 arrives on the timetable: more than half a day, so not a connection we count.