Building a viable commercial aircraft business has never been easy, not for the well established companies, let alone the new and inexperienced ones like COMAC. It's not just about technology, which have its various challenges, but also more about system integration, testing, certification, and maintenance and customer support. ARJ-21 was delayed like, what? over a decade according to the original schedule. I expect C919 would also be behind the schedule, probably not as bad as ARJ-21. Still, it looks like the expectation of first delivery to customer by the end of this year is still overly optimistic.
They just need to continue to push through all the blocks and barriers.
They just need to continue to push through all the blocks and barriers.