BA 478 then QR 3661 at Barcelona
London Heathrow → Barcelona → Palermo
Timetable, Barcelona time
12:40BA 478 from London Heathrow at the gate
09:50QR 3661 to Palermo leaves the gate
21 h 10 apart on the timetable, overnight
QR 3661 leaves 21 h 10 after BA 478 arrives on the timetable: more than half a day, so not a connection we count.