U2 8055 then A3 711 at Barcelona
London Gatwick → Barcelona → Athens
Timetable, Barcelona time
14:05U2 8055 from London Gatwick at the gate
11:20A3 711 to Athens leaves the gate
21 h 15 apart on the timetable, overnight
A3 711 leaves 21 h 15 after U2 8055 arrives on the timetable: more than half a day, so not a connection we count.