Colin P said:How does the sustainment cost for a F35 differ than a F-15/F-16/F-18? What makes those costs unique, other than it's a brandnew airplane and the learning curve presently is steep.
Not much.... or at least not in the ways people think. In terms of raw numbers, even with inflation it will cost maybe 20% more to operate than an F-16 per hour, but that's always been known. The "worst case" scenario made in 2012 by CAPE suggested 30%, though at this stage the program already demonstrated costs below that.
Its also tough to make comparisons with the other aircraft you list. Making a rough side by side comparison... Its significantly cheaper to operate than an F-15 now per hour, a 40% more expensive than a Super Hornet, and around 50% more than an F-16. The Problem is that F-15s are old twin engined aircraft with very high maintenance requirements. F-16s are getting up there as well due to age, but USAF and industry has invested a lot to wring as much efficiency in the program. Shornets are in the sweetspot in their lifescycle, but they are being run pretty hard into the ground. The way the F-35 is operated means that more of the costs are contractor related, but will require fewer staff, especially in depots.
Those numbers are artificially high because there are a large number of early LRIP jets that cost more to operate, and the overall costs will decline as the sustainment processes start to align. You can see the practical effects of that with the much higher availability of aircraft based at Hill AFB compared to the fleet-wide average. Apparently they have had less staff turnover and more time to work with the jets which has improved their numbers.
Over the past year, I've spoken to a number of people who work on the aircraft, and anecdotally they praise the ease of maintenence on the aircraft... its not just ALIS but the internal ergonomics that allows for easier access to work areas. Those will show up over time. Its not just the direct aircraft costs either; the US Military is really altering their entire system of sustainment for the F-35 that brings in more civil airlines practices. One key part is ALIS, which is being used to identify parts that are burning out more quickly (and perhaps pushing for redesign) and preemptively resolving shortages.
Hope that helps. (and sorry for the edits)