write a reply with 1 question to this: The General Electric GE9X engine represents a significant step forward in commercial aircraft propulsion. Designed specifically for the Boeing 777X and first flown in 2018, the GE9X is currently the largest and most powerful commercial turbofan in the world, producing about 105,000 pounds of thrust (GE Aerospace, 2023). What sets it apart from older engines is its combination of fuel efficiency, durability, and advanced materials. For instance, the GE9X incorporates ceramic matrix composites (CMCs), which can withstand higher temperatures than traditional alloys, allowing the engine to operate more efficiently while reducing cooling requirements (Howe, 2019). The fan diameter of 134 inches, paired with a high bypass ratio of about 10:1, also enhances fuel burn efficiency compared to earlier models such as the GE90. While these features justify GE's claim that the GE9X is the world's next great engine, I think that it shares this title with other modern designs. Pratt & Whitney's geared turbofan (GTF) series, for example, is a strong contender because its geared fan system allows for optimized speeds between the fan and low-pressure turbine, yielding significant fuel savings and reduced noise (Zhao et al., 2020). Rolls-Royce's Trent XWB, powering the Airbus A350, is also highly efficient and reliable, demonstrating how multiple manufacturers are pushing boundaries simultaneously. Despite these advances, newer engines face real world chall