BA 1335 then BA 1412 at Heathrow
Newcastle → London → Belfast City
Timetable, London time
20:55BA 1335 from Newcastle at the gate
18:45BA 1412 to Belfast City leaves the gate
21 h 50 apart on the timetable, overnight
BA 1412 leaves 21 h 50 after BA 1335 arrives on the timetable: more than half a day, so not a connection we count.