No person, while flying any type of aircraft over this City, shall operate thereon any loud speaker, siren or other device, except the unmuffled exhaust of each aircraft, which makes any noise or sound sufficiently loud to attract attention of persons on the ground; provided that the Board of Police Commissioners may issue a temporary permit for a period of time not to exceed twenty-four hours to persons to operate a loud speaker, siren or other noise making device on aircraft, if the Board determines that such operation may be necessary in connection with any important celebration in this City.