The Air Force maintains a data base on the cost to operate and support its aircraft. It's called the "AFCAP" database which is a part of the Air Force's Total Ownership Cost (AFTOC) program. It is available on public request from the Air Force Comptroller's office. Data from the 2013 version of the AFCAP database, the latest available, is at the POGO website here.
We have worked with this annually available data for the last few years, using it for analysis, reports and articles. While it has not been yet verified by an independent audit by an outsider like GAO, it is the most comprehensive data available on the operating and support costs for Air Force aircraft. It includes all known Air Force costs to keep its aircraft operating, as well as contractor supplied logistics and services. One variation of the cost estimates, known as "Ownership" cost, even includes the cost to modify aircraft with upgrades.
Chuck Hagel's A-10 Legacy
Jan 2014.
I've not found a newer version or the original source of the XLS. Presumably, you could request it from here?
http://www.saffm.hq.af.mil/questions/index.asp
Figures are averages. Some Wings of the f-16 cost twice as much as others, with the KC-135 its 3x
http://www.rand.org/content/dam/rand...AND_TR1275.pdf