JU 426 then BT 712 at Istanbul
Belgrade → Istanbul → Riga
Timetable, Istanbul time
04:40JU 426 from Belgrade at the gate
16:50BT 712 to Riga leaves the gate
12 h 10 apart on the timetable
BT 712 leaves 12 h 10 after JU 426 arrives on the timetable: more than half a day, so not a connection we count.