Just to cite from the devBlog 145:
[…] this is considered an advanced and custom feature and will not be mentioned in the tutorial. […] Again, this is not something that will be brought up in the tutorial but instead something we expect you to discover and play around with as you become more accustomed to mechanics of the game.
Why not? I don’t need it in the tutorial at the moment, but I think that for the release a lot of the components of an advanced airport could and should be explained in a glossary or tutorial. Perhaps even a separate tutorial airport where you can complete the tutorials.
Is this planned for the release?