DL 32 then BA 580 at Heathrow
Atlanta → London → Milan
Timetable, London time
09:00DL 32 from Atlanta at the gate
08:15BA 580 to Milan leaves the gate
23 h 15 apart on the timetable, overnight
BA 580 leaves 23 h 15 after DL 32 arrives on the timetable: more than half a day, so not a connection we count.