Since this is World of Airports, it’s missing much of the Inside Airport Features, that is Duty-Free, Shops, Lounges and Special Events etc!
I know this isn’t Aviation Side, but some aspects do have connections to fleet planes, just hear (technically read) me out
You can open a shop and sell things like wine, chocolates etc (maybe things that Airport / City is known for like INN Airport for the Alps, Ski Resorts so Winter Wear & Mountain stuff… BRI Airport for Pasta and Italian things) Passengers can buy stuff and the airport earns some revenue. Maybe even Airline Fleet Merch too.
You can buy shop floor spaces for companies to buy. More passengers get through, more revenue from the rent & taxes! Coffee Shops, Fast Food, language shops, tech shops, office spaces etc
My favourite part of an airport, even tho I have never been in one in-person. Business & First Class passengers of fleet and airlines can get access to the lounges and the airport can get revenue from lounge access, food etc
Special Seasonal events like special car launches, VIP Person Handling etc… Maybe Devs of WoA be VIP People and show up occasionally.
Even a “Bounce Event” where a special plane would come, get handled by you and you choose the next (Playable Airport) destination it should go to, and the plane would travel there, get handled and that Airport choses next destination etc.
Extra features like TSA & Immigration & Customs (more of these, more passengers the Airport can handle). Booking Stands (Fleet or Airlines can buy Stands), Language Systems (better system, more passengers), Parking Areas…
Overall more of these extras the Airport has, the more passengers it can handle.
It can come with achievements just like the WoA Handled Planes Achievement, same can go for a Handled Passengers Achievement
I really wish for things which involves the insides of the Airport other than buying Terminals. It could generate more money too! Yeh, I know this sounds like one of those Tycoon games, so probably it wouldn’t be liked by many. I don’t know how the economy of this would be like tho, what the prices should be. This is just an idea : D
Thank for reading