UA 3926 then UA 751 at San Francisco
Newark → San Francisco → Las Vegas
Timetable, San Francisco time
22:56UA 3926 from Newark at the gate
16:50UA 751 to Las Vegas leaves the gate
17 h 54 apart on the timetable, overnight
UA 751 leaves 17 h 54 after UA 3926 arrives on the timetable: more than half a day, so not a connection we count.