FR 3976 then FR 1982 at Dublin
Barcelona → Dublin → Biarritz
Timetable, Dublin time
19:00FR 3976 from Barcelona at the gate
12:40FR 1982 to Biarritz leaves the gate
17 h 40 apart on the timetable, overnight
FR 1982 leaves 17 h 40 after FR 3976 arrives on the timetable: more than half a day, so not a connection we count.