Section 4
SEC. 4. Except as otherwise specifically provided, the Secretary of Commerce and Communications shall administer and enforce the provisions of this Act, including air traffic rules promulgated herein or hereafter enacted, and for such purpose is authorized: To make such regulations as are necessary to execute the functions vested in him by this Act. To issue or revoke licenses for pilots, for approved types of aircraft for operation in the Philippine Islands, and for structural modification or repair of such aircraft. To incur such expenditures for personal services, and for books of reference and periodicals as may be necessary for such administration and as may be provided by the Philippine Legislature from time to time. To publish from time to time a bulletin setting forth such matters relating to the functions vested in him by this Act as he deems advisable, including air navigation treaties, laws and regulations and decisions thereunder. To operate and, for this purpose, to acquire, within the limits of the available appropriation hereafter made by the Philippine Legislature such aircraft and air navigation facilities as are necessary for executing the functions vested in the Secretary of Commerce and Communications by this Act.