UA 5347 then DL 991 at LAX
Las Vegas → Los Angeles → New York JFK
Timetable, Los Angeles time
11:53UA 5347 from Las Vegas at the gate
11:25DL 991 to New York JFK leaves the gate
23 h 32 apart on the timetable, overnight
DL 991 leaves 23 h 32 after UA 5347 arrives on the timetable: more than half a day, so not a connection we count.