Va. Code § 5.1-172
The exercise of the powers granted by this act shall be in all respects for the benefit of the inhabitants of the Commonwealth of Virginia, for the increase of their commerce, and for the promotion of their safety, health, welfare, convenience and prosperity, and as the operation and maintenance of the airports by the Authority will constitute the performance of essential governmental functions, the Authority shall not be required to pay any taxes or assessments upon the airports or any property acquired or used by the Authority under the provisions of this act or upon the income therefrom; and the bonds issued under the provisions of this act, their transfer and the income therefrom, including any profit made on the sale thereof, shall at all times be free and exempt from taxation by the Commonwealth of Virginia and by any municipality, county or other political subdivision thereof.
Va. Code § 5.1-172