BA 1401 then VS 11 at Heathrow
Belfast City → London → Boston
Timetable, London time
18:25BA 1401 from Belfast City at the gate
17:20VS 11 to Boston leaves the gate
22 h 55 apart on the timetable, overnight
VS 11 leaves 22 h 55 after BA 1401 arrives on the timetable: more than half a day, so not a connection we count.