BA 1401 then EI 387 at Heathrow
Belfast City → London → Shannon
Timetable, London time
18:25BA 1401 from Belfast City at the gate
18:05EI 387 to Shannon leaves the gate
23 h 40 apart on the timetable, overnight
EI 387 leaves 23 h 40 after BA 1401 arrives on the timetable: more than half a day, so not a connection we count.