UA 3903 then UA 434 at Houston
Newark → Houston → Los Angeles
Timetable, Houston time
09:05UA 3903 from Newark at the gate
21:56UA 434 to Los Angeles leaves the gate
12 h 51 apart on the timetable
UA 434 leaves 12 h 51 after UA 3903 arrives on the timetable: more than half a day, so not a connection we count.