I seem to recall many years ago that there was a facilities engineer at Ansett who spent a lot of his time working out exactly where those little yellow lines should go so that various sized aircraft would miss the wingtips of other various sized aircraft.
And of course Ansett never lost a wingtip that way - instead we busted the wingtip off a B767 on a Hangar door- when the heavy maintenance supervisor was the responsible wing walker no less!!
