QR 3551 then BA 487 at Barcelona
Catania → Barcelona → London Heathrow
Timetable, Barcelona time
22:35QR 3551 from Catania at the gatealso IB 5803, LL 5803, VY 6119
19:20BA 487 to London Heathrow leaves the gate
20 h 45 apart on the timetable, overnight
BA 487 leaves 20 h 45 after QR 3551 arrives on the timetable: more than half a day, so not a connection we count.