U2 8446 then U2 819 at Gatwick
Nantes → London → Belfast International
Timetable, London time
11:45U2 8446 from Nantes at the gate
09:05U2 819 to Belfast International leaves the gate
21 h 20 apart on the timetable, overnight
U2 819 leaves 21 h 20 after U2 8446 arrives on the timetable: more than half a day, so not a connection we count.