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Spirit, Frontier and Southwest are in trouble: can budget airlines survive?

The budget airline golden age may be over, with Spirit, Frontier and Southwest scrambling to change various pricing models of theirs. The airlines known for getting you somewhere cheap are not increasing prices, creating more add on costs and trying to squeeze customers. Will it work? Or will they continue to falter? Plus: Duolingo is thriving and weight loss injectables see billions in revenue.