Hi, I work in airport security.
I won’t tell you where exactly but it’s in the UK at a smaller regional airport.
What I found rather good was the staff pass system (from what i saw) closely-ish resembles the real system.
Anyway back on to your point on security.
Firstly the game may need to introduce a system for the zones, (maybe it already has it?) I will not go into too much detail on this in a public domain but I can say:…
There are different layers to security;
Public access
Anybody and Everybody is allowed in
SRA - Secured Restricted Area
Those with the correct pass OR reason for being there and identification can be there - this includes airside areas like GA aprons, fire stations etc
CP - Critical Part
Tight security measures, everybody and every vehicle is searched, you MUST have a good reason to be there I.E. You are a passenger waiting to fly, you are supposed to work in the CP, not any old staff member is allowed in. only the correct people are allowed to bring in certain things on their passes (No further detail will be given). The CP extends to parts of the apron as outlined by a red line (something you may have never noticed before?), any airport vehicle, pushback tug, fuel bowser, catering delivery etc going into the CP will be searched.
If the Devs wanted to simulate these zones properly then firstly we need to enforce these zones properly. This means Security staff on patrols, having a vehicle checkpoint. As airport vehicles come airside either into the CP they should be delayed as the security staff searches the vehicle. this is where the player could invest in expanding the CP (But this means you have to raise the amount of security staff to patrol it) or perhaps investing in a fuel farm inside the CP, or underground fuel pipes, parking areas for 'port vehicles inside the CP to save time being searched etc. But also it’s important to have the VIP’s come and go inside the SRA - they do not like spending time being searched, not our vip’s anyway.
Back to your original point regarding multiple security zones inside the airport; we don’t do this at our airport but if we did it would be very expensive to employ extra staff. The only reason i can see them putting in that extra layer of CP is to filter out some of the things you are not allowed to carry as specified by the airline. For example some airlines allow you to carry E-cigs as carry-on but other airlines do not.
Feel free to ask me anything security related and if you’re allowed to know, I will tell you