Autoglass know nothing about these babies! There are usually about 5 layers, 2 or 3 of which are full load bearing, the remainder plastic. They have all sorts of weird treatment in manufacture, and looking through them with polaroid glasses is a totally surreal experience. They are usually at leaast 2 inches thick (alright then.....5 cms), sometimes more. I have never heard of total failure. Even that awful image of the Pan Am nose lying in the Lockerbie field- the windscreen was still complete and unbroken. The windscreen is far, far stronger than the fuselage. If a large bird is going to hit the plane, I would rather it impaled itself on the windscreen and not the fuselage. Stop freaking folks- it is a common occurence! And this is a Professional Pilots website- if you want hysteria, go where the professional pilots are not!