FR 10 then IB 345 at Madrid
Dublin → Madrid → Boston
Timetable, Madrid time
22:35FR 10 from Dublin at the gate
16:00IB 345 to Boston leaves the gatealso BA 4215, AY 5369, EI 5851, AA 8801
17 h 25 apart on the timetable, overnight
IB 345 leaves 17 h 25 after FR 10 arrives on the timetable: more than half a day, so not a connection we count.