AY 1337 then KL 9936 at Heathrow
Helsinki → London → Amsterdam
Timetable, London time
17:00AY 1337 from Helsinki at the gate
12:13KL 9936 to Amsterdam leaves the gate
19 h 13 apart on the timetable, overnight
KL 9936 leaves 19 h 13 after AY 1337 arrives on the timetable: more than half a day, so not a connection we count.