The link that compares the actual cost of running the USAF ageing F-16C/D fleet (and everything associated with it), whilst being thrashed on ops, against a 2012 prediction provided by LM for an unknown point in the future that excludes a brace of F-35 associated costs?
LM's latest prediction is equally slippery but the hapless optimism has been replaced by a vague prediction that it will take another 15 to 20 years to get the CPFH under control:
Lockheed expects F-35 flying costs will take time to come down - exec - Latest News
The latest F-15 is not a paper plane - it is in production and operational use, just not with the USAF.