They built a little hill so spotters can overlook the runway and fences from a higher position. There‘s also an old MI-8 next to it that was converted to a snack bar, it‘s pretty sweet to hang out for the day.
Yeah, I don't know. Krakow had one huge observation deck, now it's all gone and there isn't a single area of the airport which would have the view of the runway(not without going through security first).
They also put a page together specifically for plane spotters.[1]
[1] https://www.zurich-airport.com/passengers-and-visitors/shopp...