People who celebrate this news are demented. Spirit serves as ULCC which provides pressure for bigger airlines to not inflate their prices. with Spirit going down, there will likely be a price increase for alot of routes.

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The last administration's DOJ stopped the merger with JetBlue because the resulting entity would be JetBlue. Removing Spirit would thus give Frontier an almost total monopoly on American ULCC market segment. Of course, JetBlue isn't doing too hot either, so there's no guarantee that a merger would have helped. United is already eyeing up to buy JetBlue.

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Allegiant. Or do you not see them as an ULCC?

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Well, allowing them to merge would mean there's only one ULCC (Frontier) in the market. Of course, hindsight is 20/20, but at the time, the government did try to maintain competition in the market.

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