BA 1349 then DL 31 at Heathrow
Saint Helier → London → Atlanta
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:40DL 31 to Atlanta leaves the gate
20 h 20 apart on the timetable, overnight
DL 31 leaves 20 h 20 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.