U2 8344 then U2 819 at Gatwick
Olbia → London → Belfast International
Timetable, London time
13:55U2 8344 from Olbia at the gate
08:40U2 819 to Belfast International leaves the gate
18 h 45 apart on the timetable, overnight
U2 819 leaves 18 h 45 after U2 8344 arrives on the timetable: more than half a day, so not a connection we count.