Yet another reason not to fly in the US. I'm 6'4 and 290; Have you ever tried to fold your legs into a space that's too small for them? I've learned to live with it and how to handle it over the years, but I'll be damned if someone arbitrarily decides because I'm (to use Rodney Dangerfield's phrase) "tall and fat" that I'll have to pay double the airfare!
I'll stick to driving my Urban Assault Vehicle -- I can put the seat back as far as I want, I can listen to whatever I want (or at least what She-who-must-be-obeyed allows me to listen to), and I don't have to fart around with the security Nazis trying to shove a wand up my butt!
And if the airlines don't like it, they can kiss my wide black behind!