UA 16 then BA 590 at Heathrow
Newark → London → Venezia
Timetable, London time
06:20UA 16 from Newark at the gate
06:10BA 590 to Venezia leaves the gate
23 h 50 apart on the timetable, overnight
BA 590 leaves 23 h 50 after UA 16 arrives on the timetable: more than half a day, so not a connection we count.