UA 3926 then BA 6428 at San Francisco
Newark → San Francisco → San Diego
Timetable, San Francisco time
22:56UA 3926 from Newark at the gate
17:00BA 6428 to San Diego leaves the gate
18 h 04 apart on the timetable, overnight
BA 6428 leaves 18 h 04 after UA 3926 arrives on the timetable: more than half a day, so not a connection we count.