Any authority vested by the Municipal Airport Law in a municipality or in the governing body thereof, for the planning, establishment, development, construction, enlargement, improvement, maintenance, equipment, operation, regulation, protection and policing of airports or other air navigation facilities established, owned or controlled, or to be established, owned or controlled by the municipality may be vested by resolution of the governing body of the municipality in an airport board, or other municipal agency, whose powers and duties shall be prescribed in the resolution. However, the expense of such planning, establishment, development, construction, enlargement, improvement, maintenance, equipment, operation, regulation, protection and policing shall be a responsibility of the municipality.