BA 176 then BA 590 at Heathrow
New York JFK → London → Venezia
Timetable, London time
07:05BA 176 from New York JFK at the gate
06:10BA 590 to Venezia leaves the gate
23 h 05 apart on the timetable, overnight
BA 590 leaves 23 h 05 after BA 176 arrives on the timetable: more than half a day, so not a connection we count.