For Economy Class, focus on lightweight materials (such as carbon fiber or magnesium alloys) to reduce fuel consumption and slim-back designs to maximize LOPA (Layout of Passenger Accommodation) efficiency. For Business and First Class, prioritize Full Flat (180-degree) capability, integrated IFE (In-Flight Entertainment) mounting, and privacy shell customization. Ensure all seats include universal power outlets (USB/USB-C) and meet pitch and width requirements specific to the aircraft model (e.g., Boeing 737 vs. Airbus A320).