A3 621 then GQ 230 at Athens
Brussels → Athens → Mykonos
Timetable, Athens time
15:25A3 621 from Brussels at the gate
06:55GQ 230 to Mykonos leaves the gate
15 h 30 apart on the timetable, overnight
GQ 230 leaves 15 h 30 after A3 621 arrives on the timetable: more than half a day, so not a connection we count.