FR 6921 then IB 5277 at Barcelona
Dublin → Barcelona → Mahón
Timetable, Barcelona time
21:40FR 6921 from Dublin at the gate
15:20IB 5277 to Mahón leaves the gatealso LL 5277
17 h 40 apart on the timetable, overnight
IB 5277 leaves 17 h 40 after FR 6921 arrives on the timetable: more than half a day, so not a connection we count.