Now they have managed that as well, landing a helicopter on top of Mt. Everest. So now there’s no problem anymore, anyone can fly to the top!
http://www.mounteverest.net/story/MysteryChopperlandsontopofEverestMay242005.shtml
The same mentioned here, so it seems to be true
http://www.defencetalk.com/news/publish/article_002441.shtml