<0.1%. It would make no sense as far as product line differentiation, would be a low volume seller, and would not justify Apple's development and production costs on a profit basis compared to other products. Also, it would compete with rMBP 15, which honestly, is extremely thing as it is. Plus, as a product, it's kind of pointless in my opinion. An Air that large of a screen size would lose a lot of its weight advantage, to the point where you might as well get the rMBP, and the footprint would be ginormous. Kind of defeats the purpose of an Air.