Yes , you can get very close to planes. We lived in Kloten for just over a year and we used to take the children there. You can cycle or walk the whole perimeter of the airport. It seems to be some kind of nature reserve as well around much of the airport . Which means there is a real juxtaposition , planes landing or taking off one side of the fence and frogs jumping in ponds the other side. In the Summer it gets really busy but at the moment I should think it would be a good time to go. We really used to like going there.