TP 8539 then UA 510 at Newark
Las Vegas → New York → Rome
Timetable, New York time
21:00TP 8539 from Las Vegas at the gate
20:20UA 510 to Rome leaves the gate
23 h 20 apart on the timetable, overnight
UA 510 leaves 23 h 20 after TP 8539 arrives on the timetable: more than half a day, so not a connection we count.