Spirit Airlines is urging U.S. regulators to block JetBlue and United’s proposed “Blue Sky” partnership, citing serious antitrust concerns similar to JetBlue’s past alliance with American Airlines. Carnival’s heavy marketing investments and private island offerings are driving strong booking growth and enabling premium pricing, according to its CEO. Meanwhile, social media–fueled tourism to Antarctica is booming, but scientists warn it’s contributing significantly to carbon emissions and environmental strain.

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