The only airline that I can find which fly from Kosice, Brno and Sliac which is called Travel Service who also have a Slovakian sister company called Travel Service Slovakia and Bulgarian Air Charter which to/from Kosice, Sliac and Vienna. I do not believe it's any of these two.
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On to another topic, I'd love Norwegian to fly to CWL, I flew them in September 2013, really nice airline. Sadly that's just wishful thinking.