BA 2617 then U2 837 at Gatwick
MLK → London → Belfast International
Timetable, London time
21:00BA 2617 from MLK at the gate
20:30U2 837 to Belfast International leaves the gate
23 h 30 apart on the timetable, overnight
U2 837 leaves 23 h 30 after BA 2617 arrives on the timetable: more than half a day, so not a connection we count.