MrsDrD, I have always had a fascination with aircraft crashes - why, how etc. Still love travelling in them though (the planes, not the crashes...). Even more interesting is reading the investigations as they unfold (eg on PPrune).. Case in point being the Air China 742 break-up (?) and whether it was the cargo door or a skin doubler that gave way - and possibly fatigue related - as you touched on in your posting. Also made me think of travelling several years ago on an AR 732 with a long skin doubler along the windows - I presume it was to reinforce the metal bonding that wasn't quite up to scratch (that Hawaiian learnt about).

I really appreciate the postings from FTers who have a passion about their job ( and / or hobby?) and share it with others in this board.