FR 3881 then EI 137 at Dublin
Dubrovnik → Dublin → Boston
Timetable, Dublin time
23:05FR 3881 from Dubrovnik at the gate
16:45EI 137 to Boston leaves the gate
17 h 40 apart on the timetable, overnight
EI 137 leaves 17 h 40 after FR 3881 arrives on the timetable: more than half a day, so not a connection we count.