In my opinion, here is how a cargo (package processing) expansion should work.
First, you can change you stands from being commercial/general aviation to being cargo (someone else suggested this). Then, you build a baggage processing facility (similar to a terminal) where your sorting, ULD loading/unloading, and scanning/security will go. This facility (the main building of the operations) should include the following:
- A drop off point for outside trucks (local) to drop off raw baggage (non-ULD).
- A drop off point for ULDs (currently on baggage trucks) unloaded from cargo planes to enter the sorting facility.
- A system of unloading ULDs, turning them into raw packages.
- Some security scanners that will check for dangerous goods, and possibly a customs system for international packages.
- Several ULD loading sites, which are similar to baggage bays for passenger flights, but only load packages into ULDs.
- A network of conveyor belts to bring the raw packages (both from the outside delivery trucks and from the now-unloaded ULDs from the planes) through the scanners, and into their respective ULD loading site (gonna need a better name).
Then, the ULDs will be loaded onto baggage trucks, and brought off to the planes where they will be loaded, and the flight will take off via the airports taxiway/runway infrastructure (shared or separate with passenger/general aviation flights).
During the time between when the ULDs are unloaded from a plane and when the new ULDs are loaded onto the plane is when other services such as refueling, de-icing, and service rounds can occur.
A new staff type could be added for the sorting facility, and there should be a way to set a workplace for ramp agents (cargo or commercial).
It would be cool if a majority of cargo planes came in at night, and then cargo planes trickle in during the day, but they could also come day-round.
In early days, ULD cargo can go on medium/large flights, and raw packages can go on small flights, until there’s enough demand for cargo only flights. (Someone else suggested this)
For additional complexity, if you’re baggage sorting facility is not efficient enough, if the loaded ULDs are late to the plane, thus delaying it, then there should be some sort of penalty, possibly a drop in reputation. This would encourage your facility to be efficient.
You could also have a system of sorting packages based on size (small, medium, and large) and have different ways of sorting based on the package size.
You could also add a warehouse that will store some packages from one night to the next, which would require a conveyor belt for the packages to get there.
When building your airport, you (as a CEO) get to decide weather you want to focus on cargo or commercial, or both, and what the right balance is between them. Of course, you’re going to have to sign contracts with cargo operators to allow them to bring packages in.
I like having to place the baggage belts, but I think that with this system, the ability to create your own custom sorting center would be wonderful. This would definatley add to the gameplay.