Columnist Shaunacy Ferro explores the world of airplane interior design, from first-class seats to in-flight entertainment systems. "In the razor-thin margins of the airline industry, even a tiny design tweak can have a huge impact on the airline's finances," Ferro writes. "One Middle Eastern airline reduced its annual fuel cost by $120,000 by using slightly thinner leather in just 16 of its first class seats on 15 planes."

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