FB 437 then OS 208 at Frankfurt
Sofia → Frankfurt am Main → Vienna
Timetable, Frankfurt am Main time
13:15FB 437 from Sofia at the gate
12:50OS 208 to Vienna leaves the gate
23 h 35 apart on the timetable, overnight
OS 208 leaves 23 h 35 after FB 437 arrives on the timetable: more than half a day, so not a connection we count.