BA 2655 then U2 8285 at Gatwick
Alicante → London → Catania
Timetable, London time
13:35BA 2655 from Alicante at the gate
13:30U2 8285 to Catania leaves the gate
23 h 55 apart on the timetable, overnight
U2 8285 leaves 23 h 55 after BA 2655 arrives on the timetable: more than half a day, so not a connection we count.