AZ 619 then FR 4858 at Fiumicino
Washington → Rome → Catania
Timetable, Rome time
07:00AZ 619 from Washington at the gate
23:30FR 4858 to Catania leaves the gate
16 h 30 apart on the timetable
FR 4858 leaves 16 h 30 after AZ 619 arrives on the timetable: more than half a day, so not a connection we count.