U2 8720 then U2 819 at Gatwick
Copenhagen → London → Belfast International
Timetable, London time
11:35U2 8720 from Copenhagen at the gate
08:35U2 819 to Belfast International leaves the gate
21 h apart on the timetable, overnight
U2 819 leaves 21 h after U2 8720 arrives on the timetable: more than half a day, so not a connection we count.