A suggestion id love to implement (probably never going to happen) is a way to set up a business jet airline. Create a third type of PAX (Pax, cargo being the others) and create some new demands to be able to run a Private jet business like Netjets and have a cargo style traffic rights.
Have Challengers, Citateons, BBJs, Gulfstreams, Learjets etc etc.
Be pretty awesome I think.
There are definately some pretty awesome business jets, but the private jet business doesn’t really fit into the game. I also think that it is hard to get reliable data about that kind of air traffic.