西子洁能：西子航空是C919机体结构一级供应商

Group 1 - Xizi Aviation is a significant business segment under the major shareholder Xizi Elevator, primarily engaged in the manufacturing of aircraft components, including airframe structural parts, composite parts, sheet metal parts, and new aviation fasteners [1] - Xizi Aviation is a first-tier supplier for the C919 large passenger aircraft and provides high-quality products and services to renowned aircraft manufacturers such as Airbus, Boeing, Bombardier, COMAC, and AVIC [1]