4thright - why is that you and so many others on this forum feel the need to revert to personal insults instead of making valid points?
It is called the Ad Hominem argument - literally 'to the man' since it involves insulting and otherwise denigrating the opponent such that by association his argument must also be worthless since he is obviously unworthy. It is used extensively by politicians and those of weak mind and position.
According to your fatuous argument, I cannot know anything about commercial aviation simply because I have been in the RAF for 30 years - not actually much real logic in there is there?
