The aerospace industry uses the waterfall model exclusively, because it is the only way to get software that is proven to work to the level of safety and reliability required.Where do you get that idea? The Space Shuttle primary flight software was developed using an iterative model: they put out releases every few months, not unlike the current kernel development process. It's even mentioned as an example on the wikipedia article.
The pure waterfall is definitely not the only way to get reliable software, in fact it is often the worst. Why not blame the methodology if it is not right for the job?
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