AZ 621 then W4 6131 at Fiumicino
Los Angeles → Rome → Nice
Timetable, Rome time
12:20AZ 621 from Los Angeles at the gate
12:00W4 6131 to Nice leaves the gate
23 h 40 apart on the timetable, overnight
W4 6131 leaves 23 h 40 after AZ 621 arrives on the timetable: more than half a day, so not a connection we count.