KL 1921 then FB 492 at Zurich
Amsterdam → Zurich → Sofia
Timetable, Zurich time
13:35KL 1921 from Amsterdam at the gate
10:00FB 492 to Sofia leaves the gate
20 h 25 apart on the timetable, overnight
FB 492 leaves 20 h 25 after KL 1921 arrives on the timetable: more than half a day, so not a connection we count.