S stands in PRG not accepting planes

I just started in PRG. I had four stands but was able to accept only two planes. Any third plane on approach triggers “No arrivals available” sign. I bought additional S stand (fifth) but I am still able to handle only 2 planes to be at the same time. How do I get a real (working) 3rd S stand in PRG or is it a bug?

Instead of a fifth stand you should have bought an arrival. Maybe you should start PRG again since you just started the airport.

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Thanks for help!