Sec. 79.3. Unauthorized commercial activity prohibited

(a) No person shall carry on any commercial activity at the airport without the prior written consent of the airport operator.

(b) No person basing or otherwise maintaining an aircraft at the airport shall permit it to be used for a commercial activity conducted at or from the airport, unless such commercial activity is expressly authorized by the terms of an agreement with the airport operator or with a fixed base operator with the airport operator's approval. In addition, no person shall permit an aircraft to be serviced, cleaned, repaired or otherwise be worked on at the airport by any person other than those operating at the airport pursuant to an agreement with the airport operator or with a fixed base operator with the airport operator's approval. No person shall operate an aircraft based or maintained at the airport for commercial flight instruction without the prior written approval of the airport operator.