Airlines stand to save a potential $580 million as travelers slim down thanks to the effects of weight-loss drugs, a new study found.Sheila Kahyaoglu, an equity analyst at Jefferies and an author of the study, says the top four U.S. airlines, American Airlines, Delta Air Lines, Southwest Airlines and United Airlines, stand to save money each year because the lessened weight will lower fuel costs."Airlines have a history of being vigilant around aircraft weight savings, from olives (pitless, of course) to paper stock," the report says. "Passenger waist lines have thus far been out of their cont...

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