; and (2) the approval of letters of agreement between air traffic control system facilities and powered-lift operators and infrastructure operators to minimize the amount of active coordination required for safe recurring powered-lift aircraft operations, as appropriate. (c) Long-term air traffic policies Beginning 40 months after the date of enactment of this Act, the Administrator shall— (1) continue to update air traffic orders and policies to support the operation of powered-lift aircraft; (2) to the extent necessary, develop powered-lift specific procedures for airports, heliports, and vertiports; (3) evaluate the human factors impacts on controllers associated with managing powered-lift aircraft operations, consider the impact of additional operations on air traffic controller staffing, and make necessary changes to staffing, procedures, regulations, and orders; and (4) consider the use of third-party service providers to manage increased operations in controlled airspace to support, supplement, and enhance the work of air traffic controllers. 958. Infrastructure supporting vertical flight (a) Update to design standards The Administrator shall— (1) not later than December 31, 2024, publish an update to the memorandum of the FAA titled Engineering Brief No. 105, Vertiport Design , issued on September 21, 2022 (EB No. 105); (2) not later than December 31, 2025, publish a performance-based vertiport design advisory circular