HV 6868 then KL 643 at Schiphol
Athens → Amsterdam → New York JFK
Timetable, Amsterdam time
23:20HV 6868 from Athens at the gate
17:05KL 643 to New York JFK leaves the gate
17 h 45 apart on the timetable, overnight
KL 643 leaves 17 h 45 after HV 6868 arrives on the timetable: more than half a day, so not a connection we count.