A Seven Aircraft Fudge Factor: The C-17 is in such heavy demand and working so well, in fact, that the fleet is being worn out at a dramatic rate. Air Force Secretary Michael Wynne, speaking at a Capitol Hill seminar Wednesday, said the C-17s are being used up at a rate “60 percent faster” than was envisioned, hence the addition of seven new C-17s in the Air Force 2007 unfunded priorities list. Wynne added that the business term for this situation is “accelerated depreciation.”
The Air Force overall reduced its size by 120 aircraft in fiscal year 2021, but kept about the same number of fighter, bomber and attack aircraft, according to data supplied by the service. The F-35 fleet saw the biggest increase while the B-1B bomber fleet saw the largest decline.