JU 1424 then JU 423 at Istanbul
Nis → Istanbul → Belgrade
Timetable, Istanbul time
16:45JU 1424 from Nis at the gate
16:40JU 423 to Belgrade leaves the gate
23 h 55 apart on the timetable, overnight
JU 423 leaves 23 h 55 after JU 1424 arrives on the timetable: more than half a day, so not a connection we count.