In May of this year, China-made large aircraft C919 smooth commercial maiden flight. This can be said to be a historic moment, the Chinese finally have their own commercial large aircraft. Many people may still not understand how impressive it is to be able to build a large airplane. Let's put it this way, at present, all over the world, only the United States, Russia, the United Kingdom and France have the ability to build large airplanes, and China is the fifth. How big is the market for large airplanes? In the next 20 years, the world will need 40,000 passenger airplanes worth $6.4 trillion.