Frontier Airlines is making its latest ploy to win over customers who frequently fly with its top competitors. And the offer could be an easy path to scoring upgrades to its brand-new first-class ...

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Carriers like Spirit and Frontier have lost customers to bigger competitors and seen their costs balloon. Some are in financial distress. By Niraj Chokshi Discount airlines reshaped the U.S. aviation ...

Spirit and Frontier are trying to reach profitability in a grim domestic market. While Frontier is seeing some gains from its premium shift, Spirit is in a more dire situation. For most U.S. airlines, ...