New delays in the certification of the Comac ARJ21 regional jet could force the Chinese aircraft maker to stretch out development of its C919 mainline commercial aircraft. The FAA is insisting that its shadow certification effort on the ARJ21 be completed before it begins work on the C919. But the C919 is already near the point at which certification agency involvement needs to begin; if the project advances much further without the agency’s involvement, the U.S. regulator may decide it ...


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