appropriated or otherwise made available by this Act or any other Act may be used to eliminate the Contract Weather Observers program at any airport. Facilities and equipment (airport and airway trust fund) For necessary expenses, not otherwise provided for, for acquisition, establishment, technical support services, improvement by contract or purchase, and hire of national airspace systems and experimental facilities and equipment, as authorized under part A of subtitle VII of title 49, United States Code, including initial acquisition of necessary sites by lease or grant