No person in any aircraft shall cause or permit to be thrown out, discharged or dropped within the corporate limits of the city or over the municipal airport, any object or things, except loose water or loose sand ballast when absolutely essential to the safety of the occupants of aircraft, or hire any person to throw out, discharge or drop any of the above-mentioned objects prohibited by this section, and all equipment, baggage and articles of personal property carried in an aircraft shall be adequately fastened in place before leaving the ground. (Prior code § 2-111)