Should they make airplanes bigger for bigger people??

I'm not big enough that it has overly troubled me but there are more and more larger people, as they build newer and bigger airplanes they should consider it. Even if they have a few designated larger seats throughout the airplane and charge extra (even though that won't be good enough and it will be complained about because the fat person is made to feel different or like a 'problem')

Sure, they're cramped for everybody as far as I'm concerned