BA 349 then BA 183 at Heathrow
Nice → London → New York JFK
Timetable, London time
21:05BA 349 from Nice at the gate
19:20BA 183 to New York JFK leaves the gate
22 h 15 apart on the timetable, overnight
BA 183 leaves 22 h 15 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.