BA 933 then BA 115 at Heathrow
Düsseldorf → London → New York JFK
Timetable, London time
15:00BA 933 from Düsseldorf at the gate
14:15BA 115 to New York JFK leaves the gate
23 h 15 apart on the timetable, overnight
BA 115 leaves 23 h 15 after BA 933 arrives on the timetable: more than half a day, so not a connection we count.