A strong stock market and improving home prices are encouraging high-income travelers to take extravagant getaways this year. Americans in lower income brackets, meanwhile, are holding back their travel spending amid higher taxes, sluggish income growth and rising travel costs. "Expect luxury travel to continue to rebound -- consistent with luxury across all industries -- while the rest of summer travel will be flat," said Adam Weissenberg, head of Deloitte's travel and hospitality division.

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