China's C919 aviation project, represented by the large passenger aircraft C919, has become a significant breakthrough and challenge in the global aviation industry. It has rewritten the competitive landscape and triggered geopolitical reactions. The C919, designed to compete with Airbus and Boeing, has gained significant orders, mainly from Chinese airlines and leasing companies. COMAC, the manufacturer, recently launched derivative models of the C919 to cater to different market needs. The shortened or plateau version is suitable for high-altitude airports, while the extended version targets the mid- to long-range market. These modifications enhance the aircraft's competitiveness and flexibility. However, the US, particularly Boeing, has been affected by China's shift away from purchasing their aircraft. US officials are reportedly considering stopping the supply of LEAP engines, which could impact the C919's production. While the C919 relies on international cooperation for core technologies, its development showcases China's potential in the aviation industry and poses a challenge to US aviation competitiveness.