AZ 621 then FR 3946 at Fiumicino
Los Angeles → Rome → Palermo
Timetable, Rome time
12:20AZ 621 from Los Angeles at the gate
07:15FR 3946 to Palermo leaves the gate
18 h 55 apart on the timetable, overnight
FR 3946 leaves 18 h 55 after AZ 621 arrives on the timetable: more than half a day, so not a connection we count.