http://online.wsj.com/article/SB10001424052702304563104576360012789361154.html U.S. aviation regulators, moving to reduce industry costs for replacing potentially thousands of defective airline seats, issued a final rule giving airlines significantly greater flexibility and more time to comply than under previous proposals. Released Wednesday, the Federal Aviation Administration's safety directive requires additional testing to determine whether some 40,000 seats manufactured by Japan's Koito Industries Ltd., and installed on more than 270 U.S. commercial aircraft, comply with mandatory safety standards. In some cases, the FAA rule also gives carriers up to six years to replace seats that fail to pass, versus a strict two-year deadline the agency proposed last fall. The Continental Airlines unit of United Continental Holdings Inc. is the U.S. carrier most affected by the rule, industry officials said. The latest move came just before European regulators, according to industry officials, are slated to issue separate, more-stringent rules requiring airlines to essentially replace all Koito-manufactured seats within 10 years—regardless of whether they pass certain mandatory safety tests.