A3 603 then GQ 670 at Athens
London Heathrow → Athens → Istanbul
Timetable, Athens time
22:20A3 603 from London Heathrow at the gate
19:15GQ 670 to Istanbul leaves the gate
20 h 55 apart on the timetable, overnight
GQ 670 leaves 20 h 55 after A3 603 arrives on the timetable: more than half a day, so not a connection we count.