IB 5803 then LA 5751 at Barcelona
Catania → Barcelona → Athens
Timetable, Barcelona time
20:55IB 5803 from Catania at the gatealso LL 5803, VY 6119
17:10LA 5751 to Athens leaves the gate
20 h 15 apart on the timetable, overnight
LA 5751 leaves 20 h 15 after IB 5803 arrives on the timetable: more than half a day, so not a connection we count.