The ARJ21 program was always supposed be a learning experience. If people learn when things go wrong, then Comac must be learning a lot, and it is giving itself more time for its lessons. The internal target for certification of Comac's 90-seat regional jet has been delayed again, to 2014 from the previously scheduled mid-2013, says a program official. Development is therefore now likely to last 12 years, with six years in flight-testing. A key reason for the latest delay is slow ...

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