BA 1403 then BA 448 at Heathrow
Belfast City → London → Amsterdam
Timetable, London time
19:30BA 1403 from Belfast City at the gate
19:25BA 448 to Amsterdam leaves the gate
23 h 55 apart on the timetable, overnight
BA 448 leaves 23 h 55 after BA 1403 arrives on the timetable: more than half a day, so not a connection we count.