BA 2633 then BA 2616 at Gatwick
Graz → London → MLK
Timetable, London time
13:00BA 2633 from Graz at the gate
12:45BA 2616 to MLK leaves the gate
23 h 45 apart on the timetable, overnight
BA 2616 leaves 23 h 45 after BA 2633 arrives on the timetable: more than half a day, so not a connection we count.