EK 15 then U2 8285 at Gatwick
Dubai → London → Catania
Timetable, London time
11:40EK 15 from Dubai at the gate
07:25U2 8285 to Catania leaves the gate
19 h 45 apart on the timetable, overnight
U2 8285 leaves 19 h 45 after EK 15 arrives on the timetable: more than half a day, so not a connection we count.