Currently, the air capacity column is used for both airbases and airship bases, with airbases taking precedence and concealing the presence of an airship base - I have airship bases in every possible location on Rhodes, Sicily, and Sardinia, and every location but Venezia in the Italian East Coast. Can you tell?
I would suggest either separating the airship bases into a separate column or adding their capacity to that of any airbases present. I'd prefer a separate column, personally.
Additionally, I can build airbases from this screen by right-clicking on a base and selecting build/expand airbases. I'd like to be able to build airship bases from this menu as well.