OS 772 then FR 9753 at Vienna
Sofia → Vienna → Banja Luka
Timetable, Vienna time
13:10OS 772 from Sofia at the gate
06:50FR 9753 to Banja Luka leaves the gate
17 h 40 apart on the timetable, overnight
FR 9753 leaves 17 h 40 after OS 772 arrives on the timetable: more than half a day, so not a connection we count.