Sentence:  Examples are in public utilities , making military aircraft and accessories , or where the investment and risk for a proprietorship would be too great for a much needed project impossible to achieve by any means other than the corporate form , e. g. constructing major <WSD>airports</WSD> or dams . 
Meaning of the word marked with <WSD> tags:  an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo