BA 581 then BA 225 at Heathrow
Milan → London → New Orleans
Timetable, London time
14:35BA 581 from Milan at the gate
13:40BA 225 to New Orleans leaves the gate
23 h 05 apart on the timetable, overnight
BA 225 leaves 23 h 05 after BA 581 arrives on the timetable: more than half a day, so not a connection we count.