"The problem emerged in 2011 and is still unresolved. Delays in Comac's earlier program, the ARJ21 regional jet, are holding up FAA recognition of the certification competence of the Civil Aviation Administration of China (CAAC). That casts doubt on the FAA's eventual acceptance of the CAAC's current work on C919 and therefore the Chinese type certificate. Without Western airworthiness endorsement, the C919 cannot be sold in main commercial aircraft markets outside of China" (Perrett, 2013)As far as domestic companies are concerned, I do not think that there will be cause for concern by Boeing or Airbus due to the fact that they are a known entity and they have stood the test of time. Major airlines or even regional airlines are not going to gamble and buy a cheaper made product out of China just to save a few dollars. The only way I see our companies beginning to purchase these products will be after enough of them have been sold and flying in China and Singapore for a while and they see no issues, but I doubt it. As far as the public's perception, I don't think the common person would be able to tell the difference between, just like I'm sure they can't tell the difference between aircraft now, except the size of the aircraft.
As far as COMAC goes, and the relationship that it has with the Chinese government is that the Chinese government owns COMAC, which is how they have enough money to even entertain the idea about making transport category aircraft. This relationship puts the airlines in a tight spot because the airlines are also owned by the government, this pressures the airlines to purchase the new aircraft regardless of the safety and quality of the aircraft. COMAC also has the ARJ21 aircraft, which is supposed to rival the Boeing 717 jet. This aircraft is also struggling to get FAA certification at this time. Due to the fact that they can not get an aircraft certified (ARJ21) or one built (C919) they continue to show up at the Singapore Aviaiton Expo trying to avoid people because they cant produce a finished product, "COMAC is staying away from the cameras and crowds in Singapore, and competitors are talking less about it." (Cendrowski, 2016)
Whether or not CORMAC becomes a viable option for transport category airliners, I do not think thi is going to affect whether or not any other companies try to compete and build airliners. The cost is way too high and it is not realy obtainable to think about trying to compete with the other major companies. The only reason that COMAC can hang with Airbus and Boeing is because they are state owned and can afford to waste the money.
No where that I can find has Boeing or Airbus commented in any way about the new aircraft that COMAC is making. Honestly if I were them I wouldn't either. This airplane is not going to be any sort of competition due to the fact that by the time the aircraft is released the A320 and the 737 are going to be so far ahead of it that there will be no cause for concern.
References:
Cendrowski, S. (2016). China’s Answer To Boeing Loses Shine. Retrieved October 29, 2016, from http://fortune.com/2016/02/16/china-comac-c919-delay-delivery/
Perrett, B. (n.d.). C919 May Be Largely Limited To Chinese Market. Retrieved October 29, 2016, from http://aviationweek.com/awin/c919-may-be-largely-limited-chinese-market