U2 8306 then U2 837 at Gatwick
Milan → London → Belfast International
Timetable, London time
20:55U2 8306 from Milan at the gate
20:30U2 837 to Belfast International leaves the gate
23 h 35 apart on the timetable, overnight
U2 837 leaves 23 h 35 after U2 8306 arrives on the timetable: more than half a day, so not a connection we count.