OS 801 then A3 780 at Athens
Vienna → Athens → Zagreb
Timetable, Athens time
12:40OS 801 from Vienna at the gate
07:35A3 780 to Zagreb leaves the gate
18 h 55 apart on the timetable, overnight
A3 780 leaves 18 h 55 after OS 801 arrives on the timetable: more than half a day, so not a connection we count.