buzzy
If you can't understand the rationale behind establishing ones credentials when discussing this type of subject, you have little understanding of how professional people (doctors, lawyers, whatever) discuss things. It is to do with the credibility of the argument, not some form of idle boasting.
Now off you go to JB, which is clearly more your level.
Rongotai
Coming back at you later.
One quick question though: are you, or have you been, an airline pilot? Simple question, no hidden inferences or attempts at denigration, and no insult intended.