Now this is going to raise a few eyebrows

From Australian website news.com.au:

Fat fliers DO pay more on Samoan Air
No, this is not an overdue April Fool's Day joke. It is real.

Samoa Air started operating in the Pacific last year. Chief Executive Chris Langton said paying per kilo is the fairest way.

"People have always traveled on the basis of their seat but as many airline operators know airlines don't run on seats they run on weight and particularly the smaller the aircraft you are in the less variance you can accept in terms of the difference in weight between passengers," Mr Langton told ABC radio.

"There is no doubt in my mind that this is the concept of the future. We always weigh the mass that is on an aircraft. And that always has to pay for the transportation, it doesn't matter whether you are carrying freight or people. Anyone who travels at times has felt they have been paying for half of the passenger next to them. The standard width and pitch of the seat are changing as people are getting a bit bigger wider and taller than they were 40-50 years ago."

Under the pay by weight system passengers input their weight into the online booking section of the Samoa Air website and pay the "pay-per-kilo" rate for that sector.

The rates range from $1 a kilogram � for the weight of the traveler and their baggage � on the airline's shortest domestic route to about $4.16 per kilogram for travel from Samoa to American Samoa.

Mr Langton told the ABC he believed many passengers would be pleasantly surprised by the cost of pay by weight.

"We have worked out a figure per kilo. This is the fairest way of you traveling with your family or yourself. You can put your baggage on, there is no separate fees because of excess baggage - it's just a kilo is a kilo is a kilo.

I have had the great pleasure to meet and to get to know a couple Samoans in Boston, Hawaii and Seattle. They are all wonderful family oriented conservative people. They are also, to the man, very large -- you could make me three times larger and I would be a small Samoan. Still, it makes sense and this significantly lowers the cost for a family with small children.