Airbus and Boeing are only two names, the reality is far far more complex, Airbus and Boeing are not different from Embraer, they are international companies, these aircraft in many ways are made by companies in both sides of the Atlantic.
To put you an example, Aernova is a Spanish company it builds parts for different aerospace clients ranging from Airbus, Bombardier, Embraer etc etc, Honeywell for example designs and build parts for both Airbus and Boeing.
Airbus and Boeing are only assemblers of the parts, they do not make everything by themselves, same are jet engines, to give you and example, ITP is a Spanish company that designs and builds the turbine fans for Rolls Royce jet engines, they design and build those parts in several countries ranging from Spain to India or Mexico.
C919 is not different, the Question is and always has been how independent COMAC can be, in my opinion, the C919 has few advantages and weaknesses as a program, they have sold 500 aircraft, that is really good, the problem is they sold the aircraft mostly to themselves, i do not think China`s aerospace industry will implode, but i think its major Challenge will be sold 100% made Chinese jets, i do not think it will happen, since all airliners have a lot of political strings attached.
What i am trying to tell you is if in Europe they buy Boeing they are buying European made aircraft parts, and vice versa, the Americans buy american made aircraft parts in Airbus aircraft.
Many countries buy aircraft based upon political alliaces, C919 is a political example, it is only mainly bought by Chinese government owned companies, basically the Chinese are following a Soviet Style model
