I have researched the whole tech tree for both CAS and Fighters but the CAS maximum organization hasn't increased beyond prewar levels. Fighter max org has increased, but not as much as I think it should. What gives?
A quick look at the units files shows that default org of CAS is constant across all levels. So the max org of basic CAS and turbojet CAS will be the same. You need to research air doctrines to increase the max org of your planes. Fighters (both multi-role and interceptors) are the same.
just research doctrines and it will work