Airline Hubs and airline administration areas
With airline Hubs airlines will be able to request for you to make your airport a hub for them.
This means they could have private hangars, terminals
and airline administration at your airport.
Hub contracts will be a new kind of contract you can sign. On the contract it should show the airlines requests. i.e. 1 main terminal with at least 500 m2 of floor area , 25 gates and 50 m2 of administration area
Administration area will be a new kind of room that will be used by airlines for airlines admin stuff.
The airline administration room will bring in income for your airport.
When you sign this contract you will be paid a large sum of cash to pay for the construction of the contract’s requests. If you construct this in time you will start getting more income as stated by the contract.
If you do not complete the requests in time the airline will start taking money from you until you get it done.
This would be a way to make more money and open up many more flight options