Installation:
You will need Guadmaz's Mape Editor and Menyoo for the teleports to work.
Install both Guadmaz's Mape Editor and Menyoo if you dont have them already.
Paste "airport.xml" into the gta 5 main directory and place "airport2.xml" in "Grand Theft Auto V/menyoostuff/Sponner" .
When in game load the map "airport" with Guadmaz's Map Editor. Then load the map "airport2" using the menyoo spooner. If you don't load these like this THE TELEPORTS WILL NOT WORK.

To get North Yankton to work you will need to load it using one of the many mods that allow you to load North Yankton. You can use menyoo to load North Yankton by going to teleports, then to other, then North Yankton. You will be teleported to North Yankton but you can now teleport back as North Yankton will be loaded at that point.