TK 6951 then GQ 671 at Istanbul
Kars → Istanbul → Athens
Timetable, Istanbul time
17:45TK 6951 from Kars at the gate
10:30GQ 671 to Athens leaves the gate
16 h 45 apart on the timetable, overnight
GQ 671 leaves 16 h 45 after TK 6951 arrives on the timetable: more than half a day, so not a connection we count.