Application‑based segmentation of the aerospace steel brake market isolates three primary end‑uses: commercial aircraft, military aircraft, and spacecraft. Commercial aircraft consume the largest slice, roughly 55 % of demand, driven by high fleet turnover, stringent safety certifications, and the need for lightweight, high‑performance brakes on narrow‑ and wide‑body jets. Military aircraft account for about 30 % of the market, reflecting the emphasis on extreme thermal loads, rapid deceleration capabilities, and the integration of advanced materials to meet combat‑ready specifications. Spacecraft represent the remaining 15 % and require bespoke brake solutions that can operate in vacuum, endure radiation exposure, and meet ultra‑reliable performance thresholds for re‑entry and orbital maneuvering. This application breakdown directly informs total market valuation, as each segment’s distinct technical criteria and procurement cycles dictate distinct pricing, volume, and growth trajectories.