BA 1349 then B6 20 at Heathrow
Saint Helier → London → New York JFK
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:20B6 20 to New York JFK leaves the gate
20 h apart on the timetable, overnight
B6 20 leaves 20 h after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.