GQ 671 then A3 602 at Athens
Istanbul → Athens → London Heathrow
Timetable, Athens time
23:10GQ 671 from Istanbul at the gate
13:25A3 602 to London Heathrow leaves the gate
14 h 15 apart on the timetable, overnight
A3 602 leaves 14 h 15 after GQ 671 arrives on the timetable: more than half a day, so not a connection we count.