Miss. Code § 61-11-5
When a certificate, permit, rating or license is required for an airman by the United States, it shall be kept in his personal possession when he is operating within the state and shall be presented for inspection upon the demand of any peace officer, or any other officer of the state or of a municipality or member, official or employee of the Mississippi Department of Transportation authorized pursuant to law to enforce the aeronautics laws, or any official, manager or person in charge of any airport upon which the airman shall land, or upon the reasonable request of any other person.
Where a certificate, permit or license is required by the United States for an aircraft, it shall be carried in the aircraft at all times while the aircraft is operating in the state, shall be conspicuously posted in the aircraft where it may be readily seen by passengers or inspectors, and shall be presented for inspection upon the demand of any peace officer, or any other officer of the state or of a municipality or member, official or employee of the Mississippi Department of Transportation authorized pursuant to law to enforce the aeronautics laws, or any official, manager, or person in charge of any airport upon which the aircraft shall land, or upon the reasonable request of any person.
Miss. Code § 61-11-5