Long term, I think the air mechanics could really use a 'paradigm shift' to where an air wing is handled like the ground force division -- that is, you use the "division planner" to put squadrons (battalions) in groups (columns), use the existing unit training interface to crank them out, and then such units are attached to the current battle plans just like the ground force divisions, and handle support/bombing/interception in the marked/assigned area/province(s) accordingly.
So kind of similar to HOI3, but instead of having to make separate plan strikes for all your air units etc you just draw the fronts and their advances the regular HOI4 way, and assigned planes automatically get involved in fights along these fronts.