The economy cabin is losing the turf war on airplanes. Airlines are retrofitting their passenger jets or buying new ones that have a larger share of premium seats. Their goal is to squeeze more revenue out of each seat flown, catering to travelers willing to pay up for lie-flat and extra legroom seats. Carriers with first-class sections like Delta Air Lines and United Airlines have increased premium seating on flights over the past decade. Now, low-frills flying pioneer Southwest Airlines, and low-cost carriers like Spirit and Frontier are adding seats that give passengers perks like a few extra inches of…

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