DL 52 then FB 492 at Zurich
New York JFK → Zurich → Sofia
Timetable, Zurich time
10:50DL 52 from New York JFK at the gate
10:00FB 492 to Sofia leaves the gate
23 h 10 apart on the timetable, overnight
FB 492 leaves 23 h 10 after DL 52 arrives on the timetable: more than half a day, so not a connection we count.