No, even __bone structure__ width, shoulders, knees to hips. Airline seats seem sized to accommodate a hypothetical 'average' adult; not the maximum of any given dimension for a even a healthy adult.
If you don't account for leg length, or lack of thereof which affect large people more than seat width, any not morbidly obese adult fit in an Airline seat. You may have a distorted view of what consist an healthy adult. And no people spending a lot of time lifting weight to grow muscles more than the typical crossfit athlete would are not healthy. They lose so much flexibility they can't do many simple thing, let alone scratch their back.
The fact is there are many non healthy adults and the question is what do we do about them. Is flying a fundamental right? Should people with over the top obesity have to pay more to use 2 seats? Should large people have to pay extra or business class tickets to get a decent leg length?
It's probably more efficient to just get two neighboring seats, lift the arm rest and get a belt extension. Chasing maximum sized people seems inefficient. Imagine designing a plane with each seat having to fit someone like Brian Shaw.
The fact is there are many non healthy adults and the question is what do we do about them. Is flying a fundamental right? Should people with over the top obesity have to pay more to use 2 seats? Should large people have to pay extra or business class tickets to get a decent leg length?