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Some of my ideas I made. (Its a few of them so tell me which ones you like/dislike)
PARKING SYSTEM:
Roads are one way. For it to work there need to be only 1 entry and 1 exit. Something like this. If you add more the zoning system might not work.
So at the entry/exit you add these:

You connect the exit with entrance. You can set the payment per hour and the zone color.
HOW IT WORKS:
Passenger arrive at the airport they can use the drop off or park at the parking. They will arrive back in 1-5 days. They will pay a hourly fee.
FIRST CLASS/BUSINESS CLASS
First class and business class passengers will go to drop off and staff will take their car and park it at a zone you selected for fc/bc passengers. They will pay the fee as well.
RENT-A-CAR
Rent a car companies will require an office outside of the secure zone. When you make an office and zone it you can select the company.
When you select the company you will then need to place car parking. It can be in the zoned parking or no. Then you select which company can use it like this:
So what you think?