The air simulation is fundamentally flawed, and is even inconsistent. CAS/tac bombers suffer mission efficiency/plane count penalties if they don't have enough range to cover the whole zone, but are also only capable of supporting battles that are happening within their range. Being able to magically teleport aircraft from an airfield into whatever zone and skipping whatever space is between the airfield and that zone, is absolute nonsense. Only having 3 missions a day at exactly the same time every day is nonsense. Only being able to fit 5 AA guns in the entirety of siberia, but you can fit the same 5 guns into Luxembourg is nonsense. Being able to have a wing, a single wing, the smallest and practically only level of organization for the air war, being able to range for a single airplane to 1000 airplanes is absolutely massive difference in flexibility compared to any other environment of the military. Being able to build an airfield in an enemy-controlled province while you control the state is absolute nonsense. Being able to fit 2000 planes on Johnson atoll is absolute nonsense.
I mean, a lot of other parts of the game can use a bunch of fixes and tweaks, but considering they have already overhauled the air sim, there is still a lot of work that needs to be done.