Legacy carriers are pouring money into their premium-class product even as they cut amenities and services offered in coach, says travel columnist Nicholas Kralev, treating the two cabins as if they were on entirely separate planes. "Our strategy is to cater to both business and leisure travelers and offer a product mix that appeals to both groups," says a spokeswoman for US Airways. But some international carriers, including Singapore Airlines, believe that the two-in-one approach can damage the overall brand. "We try to provide the best travel experience, with robust and consistent delivery, no matter in which cabin you are sitting," says a Singapore spokesman.

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