WK 439 then DL 53 at Zurich
Split → Zurich → New York JFK
Timetable, Zurich time
16:50WK 439 from Split at the gate
13:30DL 53 to New York JFK leaves the gate
20 h 40 apart on the timetable, overnight
DL 53 leaves 20 h 40 after WK 439 arrives on the timetable: more than half a day, so not a connection we count.