Chinese companies like Comac can produce airframes roughly comparable to Airbus, however they're still struggling with engines. It will be interesting to see if AECC succeeds in building a turbofan with fuel efficiency and reliability comparable to western designs. Without a good engine they don't have a viable airliner.
Comac is not even close. With the ARJ21 they have the old DC-9 tooling, a brand new wing from the Ukrainians (Antonov), engines from General Electric, and they still can't get it certified in Europe or the US. Even Chinese airlines don't want it.
