BA 190 then BA 756 at Heathrow
Austin → London → Basel
Timetable, London time
10:05BA 190 from Austin at the gate
09:25BA 756 to Basel leaves the gate
23 h 20 apart on the timetable, overnight
BA 756 leaves 23 h 20 after BA 190 arrives on the timetable: more than half a day, so not a connection we count.