AZ 621 then FR 3181 at Fiumicino
Los Angeles → Rome → Barcelona
Timetable, Rome time
12:20AZ 621 from Los Angeles at the gate
10:25FR 3181 to Barcelona leaves the gate
22 h 05 apart on the timetable, overnight
FR 3181 leaves 22 h 05 after AZ 621 arrives on the timetable: more than half a day, so not a connection we count.