What are the Functions of Llama Cargo Airline's Airport in SimCity BuildIt?

Once your airport has completed the 1 day and 7 hour construction period you will be set up with a brand new and fully operational airport for your city.

It main function is obvious considering the name of the main airline (Llama Cargo Airlines) involved and so its flights are centered around the delivery of cargo to and from your city.

Who is Mayor Daniel in SimCity BuildIt and how to Connect to Him?

Introduction to Mayor Daniel, his City and his Trade Depot:

Early on in the game every player gets introduced to Mayor Daniel who is the Mayor of your first neighbouring city and the purpose of this meeting is two-fold:

1) Learning How to Make Connections with Other Cities

This is to show you that other cities can be added as friends later when you connect to them via Facebook. By connecting to other cities it means you can also easily visit your friend's Trade Depot and they can easily visit yours increasing the chances of your buying and selling the items that you want at a price that is reasonable.