ORLANDO, Fla. -

As if flying already didn't cost an arm and a leg, people keep thinking of ways the airlines can make you pay extra. Among the latest ideas, basing your fare on how much you weigh.

Professor Bharat Bhatta argues that by reducing the weight on a plane by a little more than 2 pounds will result in fuel savings of $3,000 a year.

Bhatta is proposing that passengers self-declare their weight when they book a ticket.

One airline is already charging passengers based on their weight. Samoa Air, operating out of the Pacific, charges passengers by the pound.

Meanwhile, Southwest Airlines already requires oversized passengers to book 2 seats.