BA 2655 then U2 819 at Gatwick
Alicante → London → Belfast International
Timetable, London time
13:35BA 2655 from Alicante at the gate
08:35U2 819 to Belfast International leaves the gate
19 h apart on the timetable, overnight
U2 819 leaves 19 h after BA 2655 arrives on the timetable: more than half a day, so not a connection we count.