This action proposes performance-based regulations to enable the design and operation of unmanned aircraft systems (UAS) at low altitudes beyond visual line of sight (BVLOS) and for third-party services, including UAS Traffic Management (UTM), that support these operations. The FAA Reauthorization Act of 2024 directs the development of this proposed rule. This proposed rule is necessary to support the integration of UAS into the national airspace system (NAS). This proposed rule is intended to provide a predictable and clear pathway for safe, routine, and scalable UAS operations that include package delivery, agriculture, aerial surveying, civic interest, operations training, demonstration, recreation, and flight testing. TSA proposes to make complementary changes to its regulations to ensure it can continue to impose security measures on these operations under its current regulatory structure for civil aviation.