Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford told lawmakers this week the estimated cost to sustain the F-15EX is about "50 percent less" than that of the fifth-generation F-35 -- a difference that is driving the Pentagon’s proposal to buy more fourth-generation aircraft in its fiscal year 2020 budget. "There's not that much difference in the procurement cost, but there's about a 50 percent difference in the operations and sustainment cost between the F-15 and the F-35,"...
