QR 3711 then BA 477 at Barcelona
Mahón → Barcelona → London Heathrow
Timetable, Barcelona time
14:35QR 3711 from Mahón at the gate
12:25BA 477 to London Heathrow leaves the gatealso IB 3659, AA 6815, VY 9555
21 h 50 apart on the timetable, overnight
BA 477 leaves 21 h 50 after QR 3711 arrives on the timetable: more than half a day, so not a connection we count.