And as a further to what Gonzo has said Evil Lord Ham, airlines can offer all sorts of wonderful package deals, provide an economy/business/first class service and alike.
As to airports, yes there are parts of the operation that are regulated, such as "Thou shall have taxiway lighting so far apart"........but tell me how much of BAA's profit come from rent from retail shops in terminals, hotels constructed on airport land, parking, hire car companies etc.
Tell me Mr Lord Ham. Here in Canada ATC has been deemed an essential service by Transport Canada. Is it just them pissing in our pockets?