A3 600 then BA 1348 at Heathrow
Athens → London → Saint Helier
Timetable, London time
11:10A3 600 from Athens at the gate
08:35BA 1348 to Saint Helier leaves the gate
21 h 25 apart on the timetable, overnight
BA 1348 leaves 21 h 25 after A3 600 arrives on the timetable: more than half a day, so not a connection we count.