My vision of this game includes a FAA or other governmental board certificaiton rating. This rating again affects which airlines, franchises and so on wants to operate at your digs.
Security, cleanliness, number of runways differing orientation and so on should affect this rating, and last but not least, Fire crew response time.
To meet said requirements for the different kind of ratings, you have to either experience an incident (but that will also greatly damage your rating for some time), or run regular drills to ensure you have the needed facilities and so on.
I even have taken the time to make a suggested list of rating-points
1 - General Aviation/recreational/private airstrip
-requires ATC-tower, and signed contract with emergency response services (minimum)
2 - Touch & Go commercial airstrip
- requires all of the above, security checkpoint, check in desk, ramp agents, gate and boarding desk
3 - Regional Airport
- Requires all of the above, In-house fire department, refueling services, baggage handling, avg cleanliness above X,
info desk
4 - Domestic/National Airport
- Requires all of the above, emergency response time below X (before incident is resolved during drill), info screens - visible throughout x% of your airport, intercom system, Baggage security scanners (basic and advanced), Aircraft - - - maintenance facilities
5 - International Airport
- Requires all of the above, Customs, Passport control, immigrations representative office(works as franchise),
Emergency response time below X, In-house medical emergency crew stationed, At least two runways,
Baggage security (manual station), A secure and separate international zone.
6 - Continental HUB
- requires all of the above with international contracts satisfaction above x, passenger flow pr week above x, tax free
All of these 6 points should be freely divided into subratings (star rating) so that if you are rated a category 5 airport you need to reach 5 stars before being able to be upgraded to the next category, certification takes place once a year. In addition if you over, let’s say 2 years fall short of complying with the requirements of your current rating after dropping to 1 star, you’ll get demoted.
This will really pose a challenge, and i’d love to see it in game. This means that you can quickly build a large airport, but will never be done tweaking it for optimum safety and efficiency. Requirements and stricktness should be adjustable through difficulty-settings, or disabled for those who want a “zen” experience.