BA 1327 then DL 31 at Heathrow
Newcastle → London → Atlanta
Timetable, London time
12:45BA 1327 from Newcastle at the gate
12:40DL 31 to Atlanta leaves the gate
23 h 55 apart on the timetable, overnight
DL 31 leaves 23 h 55 after BA 1327 arrives on the timetable: more than half a day, so not a connection we count.