China quietly more than doubled production efficiency for its most advanced stealth fighter jet by converting a Chengdu factory to fully autonomous "dark factory" operations. AI-driven machines and autonomous vehicles running nearly 24/7, no lights needed. The plant now produces structural components for the J-20 ("Mighty Dragon") — China's F-22 equivalent — with minimal human involvement, cutting costs and removing round-the-clock staffing. Mass production of the J-20 began in 2020. Source: SCMP