Final answer:
No person may operate an aircraft that has an experimental certificate unless otherwise specifically authorized.
Step-by-step explanation:
Unless otherwise specifically authorized, no person may operate an aircraft that has an experimental certificate. In aviation law, experimental certificates are issued to aircraft that are being tested for new designs or modifications. These aircraft are subject to certain restrictions and must comply with specific regulations. Without proper authorization, operating an aircraft with an experimental certificate would be a violation of aviation law.