You literally have to pay for everything! Example..I built my flight training school so my plane can travel to further locations. So once you start building it you see that now you need certain items. I need 2 helmets..2of this 2 of that. It costs 17$ (In game currency) to get them right away. So mind you I've been playing this game for about 2 months. I have yet to find 1 of those items. So that was 1 building right..now magnify that for EVERYTHING you build. And that's how this game plays!