Stargazer, I am not aware that I have to justify my occupation to other members of the forum. My profile accurately answers all the relevant fields, nothing more nor less. Come and chat at the show and you may judge for yourself. If you take friendly and light-hearted comments to heart as showing a large ego that is your view - maybe I do have, but again I am not aware that I have to apologise for that, especially in the company we keep on PPRuNe.