Lol. It is pretty clear that the key point of the summary I quoted was that the consensus among economists who have studied this was that at least 60% of the decline in airfare prices can be attributed to deregulation. You didn’t need to put in all this effort to misinterpret it. (No one was adding percentages or whatever you were claiming.) Them rounding to the nearest multiple of 10 is reasonable - not rounding would be implying a higher precision than is really warranted.
If anyone is reading this thread, it illustrates a problem common in on-line discussions. Someone will make a big claim that contradicts the consensus of the experts in the fields who have studied the issue. (I have found that when discussions touch upon economics, it is virtually guaranteed, but it happens in many areas.)
Someone then points out that if the person is correct and the consensus position of the experts who have studied this issue are all wrong, the burden of proof is on them. The original poster won’t try and do this but will instead try to come up with a reason that those who devote their careers to actually studying these issues can’t be trusted or are incompetent, etc. Unfortunately, at this stage, the person is usually even more entrenched in their personal pet theory. They usually aren’t so blatant as to say “Either they are utterly incompetent or lying.”, but that is where we are.