EK 210 then JU 533 at Athens
Newark → Athens → Belgrade
Timetable, Athens time
16:00EK 210 from Newark at the gate
15:50JU 533 to Belgrade leaves the gate
23 h 50 apart on the timetable, overnight
JU 533 leaves 23 h 50 after EK 210 arrives on the timetable: more than half a day, so not a connection we count.