BA 541 then BA 225 at Heathrow
Bologna → London → New Orleans
Timetable, London time
13:45BA 541 from Bologna at the gate
13:40BA 225 to New Orleans leaves the gate
23 h 55 apart on the timetable, overnight
BA 225 leaves 23 h 55 after BA 541 arrives on the timetable: more than half a day, so not a connection we count.