> If this was doable and there was a market for it, what on earth would stop Boeing and Airbus Boing and Airbus have lots of things to choose from to focus the

> If this was doable and there was a market for it, what on earth would stop Boeing and Airbus Boing and Airbus have lots of things to choose from to focus their (large, but still limited) resources on. Even if they think it is doable and has a market, they'd probably also think that improving what they have is less risky and a bigger market.