I thought they had it...you know "Customers of Size" have to buy an extra seat if they cannot put down the arm thing...I think thats how they tell, if you can't put down your armrest, you need to buy another seat.

Here's a thought. How about they put larger seats on planes? Damn things are too narrow and uncomfortable. That's why I prefer to fly first class, the seats are quite a bit larger and more comfortable.

Because that would mean fewer total seats in the area available. Fewer seats = fewer paying customers = less money. The only way they could make more space per passenger worth their while is by substantially increasing prices. (ie. that's a big part of what you pay for in first class) 

Which is more logical, but would be viewed as discrimination.  And which part would be measured?  Waist? Hips? Shoulders?  A non-obese person can still have really wide body (shoulders, hips). 

Bodies are different, period.  How will you find a "fits all" solution?

And not so much "huge bulging muscles," (LoL), as just tall and toned muscles. (Muscle weighs more than fat.)

Yes, that is a fact, however it would take a lot of convincing to make people accept that.  As usual, immediate implementation will have everyone in an uproar.

If you can find a way to slowly implement a policy of the overly-large paying extra it will be much more accepted.

*Gasp* You are DISCRIMINATING AGAINST BODY BUILDERS! HOW DARE YOU!

The big problem here is that it would be abused by the airlines as an excuse to charge more and add more seats.  The seats are already too small and with far too little leg room.  At least they are from my experience in most European airlines (and not just the budget ones).

I am not over wieght and often struggle to get comfortable.  The funniest thing is the advice they give you for exercising whilst in your seat on longer flights - if you can do those whilst staying in your seat and not pulling a muscle or poking your neighbours in the eye - you are a midget contortionist.

I have also been on flights where there were some seats that it was physically impossible for anyone of a modest height to actually sit in them.  My father in law is only as little taller than me and slim - he simply could not get his legs into the seat even twisted at a painfull angle.  Luckily the flight was not fully booked and he was able to get a seat elsewhere.

Also, how would a "fatty" paying extra actually help you? Do you honestly think that the airline isn't going to fill the seat next to them even if they have paid extra?

The human race is getting larger and the seating on flights needs to reflect this - before we even think about "unnaturally large" people.

I would say that the seats should be roomy enough to accomodate a decent percentile of the human population.  If that means less seats, fewer passengers and higher prices then so be it.  Being able to fly somewhere (cheaply) is not a right.  It is a symptom of the current "must have" society that everything has to be cheap and available to everyone or its considered some sort of infringement of your rights.

When I grew up I was taught that if you can't afford something then you didn't get it.  It didn't mean you were any less of a person, it was just out of your reach.  If you wanted it badly enough you saved up until you could afford it.  I still live by that principle.

Let's not even get into leg room; I'm short in the legs and even I have a hard time fitting my legs comfortably if anything bigger than a hamster is stored under the seat.

Good to see there are at least a couple of people still out there living by the "only buy what you can afford now" principle.  I do have criedit cards but only as a matter of convenience and always paid off when the bill comes in.

Incidentally airlines already charge extra (at least in Europe) for additional leg room.  I currently choose not to pay for this on the principle that the default leg room is usually insufficient and I don't see why I should pay more (individually) to get it up to a decent level.  That might be cutting off my nose to spite my face but there you go.

But wouldn't that be what happens?

More leg room, wider seats = more expensive tickets and/or fees.

"Individually"

So as long as it isn't just you paying (for your own comfort), then you are okay with paying more, correct?

I agree whole-heartedly with your premise, just not your argument. 

No, they need to do the same as they do with carry on luggage - there is a box or test seat and if you don't fit in it entirely you need a second seat/first class seat/etc.