AZ 615 then FR 3181 at Fiumicino
Boston → Rome → Barcelona
Timetable, Rome time
07:15AZ 615 from Boston at the gate
23:00FR 3181 to Barcelona leaves the gate
15 h 45 apart on the timetable
FR 3181 leaves 15 h 45 after AZ 615 arrives on the timetable: more than half a day, so not a connection we count.