BA 1349 then BA 297 at Heathrow
Saint Helier → London → Chicago
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
15:40BA 297 to Chicago leaves the gate
23 h 20 apart on the timetable, overnight
BA 297 leaves 23 h 20 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.