UA 576 then F9 2334 at LAX
Chicago O'Hare → Los Angeles → Las Vegas
Timetable, Los Angeles time
17:35UA 576 from Chicago O'Hare at the gate
17:15F9 2334 to Las Vegas leaves the gate
23 h 40 apart on the timetable, overnight
F9 2334 leaves 23 h 40 after UA 576 arrives on the timetable: more than half a day, so not a connection we count.