HY 281 then GQ 671 at Istanbul
Tashkent → Istanbul → Athens
Timetable, Istanbul time
04:30HY 281 from Tashkent at the gate
22:45GQ 671 to Athens leaves the gate
18 h 15 apart on the timetable
GQ 671 leaves 18 h 15 after HY 281 arrives on the timetable: more than half a day, so not a connection we count.