the Working Capital Fund will be fully reimbursed by each customer agency from available funds for the actual cost of the transit benefit. Federal aviation administration Operations (airport and airway trust fund) For necessary expenses of the Federal Aviation Administration, not otherwise provided for, including operations and research activities related to commercial space transportation, administrative expenses for research and development, establishment of air navigation facilities, the operation (including leasing) and maintenance of aircraft, subsidizing the cost of aeronautical charts and maps sold to the public, the lease or purchase of passenger motor vehicles for replacement only, in addition to amounts made available by Public Law 112–95 , $10,410,758,000, to remain available until September 30, 2020, of which $9,594,758,000 shall be derived from the Airport and Airway Trust Fund, of which not to exceed $7,840,013,000 shall be available for air traffic organization activities