U2 820 then U2 869 at Gatwick
Belfast International → London → Glasgow
Timetable, London time
19:05U2 820 from Belfast International at the gate
18:35U2 869 to Glasgow leaves the gate
23 h 30 apart on the timetable, overnight
U2 869 leaves 23 h 30 after U2 820 arrives on the timetable: more than half a day, so not a connection we count.