Dutch airline KLM has been preparing for a new and more-luxe business-class experience, featuring 34 lie-flat seats equipped with privacy doors and 19-inch touch screens. But there’s a problem. The seats, which the carrier is marketing to high-end fliers on a brand new long-haul jet, haven’t yet been certified by aviation authorities. So when it launches its inaugural flight featuring the seats in September, they will be empty. Lufthansa has had a similar problem. So does Singapore Airlines. A number of carriers, including United and American, have debuted new business-class suites with their doors locked open, awaiting approval. Airlines are…

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