The airport director shall have the right at any time to close the airport in its entirety or any portion thereof to air traffic , to delay or restrict any flight or other aircraft operation,to refuse takeoff permission to aircraft, and to deny the use of the airport or any portion thereof to any specified class of aircraft or to any individual or group, when he considers any such action to be necessary and desirable to avoid endangering persons or property and to be consistent with the safe and proper operation of the airport