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Samoa Air, a small island airline, has become the world's first airline to implement a "pay as you weigh" pricing model that calculates passengers' flight tickets based on their body weight, according to reports.

"This is the fairest way of traveling," Samoa Air chief executive Chris Langton told Australia's ABC Radio. "There are no extra fees in terms of excess baggage or anything—it is just a kilo is a kilo is a kilo."

The airline, which flies domestically and to American Samoa, the Cook Islands and Tonga, will charge rates ranging from $1 a kilogram on the airline's shortest domestic route to about $4.16 per kilogram for travel from Samoa to American Samoa, according to ABC Radio.

Under the new pricing system, passengers of Samoa Air, which operate N2A Islander and Cessna 172 aircraft, will need to enter their estimated weight during online booking and airfare will be calculated using their weight. "You travel happy, knowing full well that you are only paying for exactly what you weigh... nothing more," states the Samoa Air website.

Langton believes his airline's new payment policy will also help promote health and obesity awareness in Samoa, a Pacific island nation with a serious obesity problem, reports the the Sydney Morning Herald.

Some airlines have policies in place that require obese passengers to reserve two seats instead of one but this is the first time an airline has implemented a per-kilo rate.

"People generally are bigger, wider and taller than they were 50 years ago," Langton told ABC Radio. "The industry will start looking at this."

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