This question already has an answer here:
My friend was asking "from which European cities can you fly non-stop to Mumbai?"
Similarly I'd like to know all cities in Europe with non-stops to Hong Kong.
(Note too that ideally it would be better to know "dailies"... since once a week etc kind of sucks.)
The only way I know to do this currently:if you go to the online live departures board for an airport, say Zurich, and if you look through a couple of day's worth, you will indeed, discover, pretty much all the non-stop flights from that city! This is not ideal, so someone may have a better answer.
So, the best way to find this info? All the non-stop possibilities from X to which European cities?