BA 1349 then BA 177 at Heathrow
Saint Helier → London → New York JFK
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:55BA 177 to New York JFK leaves the gate
20 h 35 apart on the timetable, overnight
BA 177 leaves 20 h 35 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.