Still, it would add some stratigy and refelct something that did happend.
afterall artllery, something already attahed to every infantry and armor unit, is in the game right? what does that represent?
an airfield could represent a heavy concentration of airfeilds that allows for an increased amount of air units on an inland.
like normally only one air unit per inland put with an airfeild you can have as many as you want. and maybe you could also have rules for bombing them.
ports were pretty common to, put we are talking about adding them in the game.
ports and airfields go togther like peanut butter and jelly, it would be wierd to have a game without with one but not the other.