BA 473 then BA 470 at Heathrow
Barcelona → London → Palma de Mallorca
Timetable, London time
11:40BA 473 from Barcelona at the gate
08:00BA 470 to Palma de Mallorca leaves the gate
20 h 20 apart on the timetable, overnight
BA 470 leaves 20 h 20 after BA 473 arrives on the timetable: more than half a day, so not a connection we count.