BA 1401 then BA 350 at Heathrow
Belfast City → London → Nice
Timetable, London time
17:05BA 1401 from Belfast City at the gate
16:55BA 350 to Nice leaves the gate
23 h 50 apart on the timetable, overnight
BA 350 leaves 23 h 50 after BA 1401 arrives on the timetable: more than half a day, so not a connection we count.