BA 1335 then JL 44 at Heathrow
Newcastle → London → Tokyo
Timetable, London time
20:55BA 1335 from Newcastle at the gate
18:30JL 44 to Tokyo leaves the gate
21 h 35 apart on the timetable, overnight
JL 44 leaves 21 h 35 after BA 1335 arrives on the timetable: more than half a day, so not a connection we count.