IIRC A book writen 25 years ago by Norm Augustine (CEO of Lockheed Martin) "Augustine's Laws" had an analysis of the unit cost of fighter aircraft and if the unit cost on U.S. fighter aircraft were plotted from the early 1950's by about 2040 or so the entire U.S. defense budget would be needed to buy one aircraft. "Just buy one aeroplane and let the aviators take turns flying it"