Hi, I’m not a new player but I don’t understand how to unlock other airports without spending golden planes. When I played a long time ago I had to manage a defined number of passenger but now that I restarted to play this game I don’t understand. Can you help me? Thank you 
Just play through the levels of the airports you have unlocked and when you reach a certain level, you can claim the next airport as a reward.
There was a link to the Prague Airport website which had a QR code that unlocked PRG as well, not sure if that’s still a thing?
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I tried it and it didn’t work
Yeah it’s gone now, not sure when it was removed