U2 818 then U2 871 at Gatwick
Belfast International → London → Glasgow
Timetable, London time
08:00U2 818 from Belfast International at the gate
07:05U2 871 to Glasgow leaves the gate
23 h 05 apart on the timetable, overnight
U2 871 leaves 23 h 05 after U2 818 arrives on the timetable: more than half a day, so not a connection we count.