BA 1399 then BA 400 at Heathrow
Belfast City → London → Amman
Timetable, London time
16:35BA 1399 from Belfast City at the gate
16:00BA 400 to Amman leaves the gate
23 h 25 apart on the timetable, overnight
BA 400 leaves 23 h 25 after BA 1399 arrives on the timetable: more than half a day, so not a connection we count.