FR 3180 then AZ 614 at Fiumicino
Barcelona → Rome → Boston
Timetable, Rome time
11:15FR 3180 from Barcelona at the gate
10:15AZ 614 to Boston leaves the gate
23 h apart on the timetable, overnight
AZ 614 leaves 23 h after FR 3180 arrives on the timetable: more than half a day, so not a connection we count.