This is more of a suggestion than a request. It just surprises me that two very different airports can be in the same size class.
For my example I will use Birmingham and Heathrow in the UK.
Birmingham is a single runway airport with one terminal, at most 50 gates and maybe 40 more small stands. This is a class 5 airport in AWS.
Heathrow is a 2 (soon 3) runway airport with 5 terminals (as it currently stands) and hundreds of gates. It's also in the same class 5 size as Birmingham in AWS.
My point is that maybe there could be a sixth airport size class for these so called super airports... it might also help on the rules of limits of airlines allowed, slot fees, movements and rules on refuel stops. It could also have a meaning on A380 compatability (although runway length is already a factor and this may just be overcomplicating things).
I could name many other airports other than Heathrow to illustrate this but my best knowledge is about the UK industry.
I don't think this is crucial to the game but it was just a thought I would like you to consider.
Thanks for reading this.