Mississippi Code Title 27. Taxation and Finance § 27-35-703

(1) The department shall annually assess, adjust, equalize and apportion the valuation of all aircraft of each airline company of a type or model operated in this state by such airline company by such type or model. Such aircraft shall be valued by the department in the same manner as other personal property in the state is valued.

(2) Each airline company shall file with the department, on or before the first day of April of each year, a complete schedule of all aircraft of a type or model operated in this state by such company. Such schedule shall be made under oath on forms prescribed and furnished by the department. If any airline company shall fail, refuse or neglect to file the required schedules, such company may be penalized in the manner provided for in Section 27-35-305.

(3) The assessment when made and completed shall remain open for twenty (20) days for inspection in the offices of the Department of Revenue and be subject to objections by the airline companies for the same time period. The Board of Tax Appeals shall hear all objections, and it may increase or decrease any assessment if such action appears to be necessary and proper.

(4) Any objection shall be in writing and filed with the Executive Director of the Board of Tax Appeals within the twenty-day period set out in subsection (3) of this section for objections. At the time of filing the objection with the Executive Director of the Board of Tax Appeals, the taxpayer shall also file a copy of his written objection with the Department of Revenue.