Md. Code, Transportation § 5–301

(a) In this subtitle the following words have the meanings indicated.

(b) “Commercial use airport” means any publicly or privately owned airport at which:

(1) Landing or tie down fees are charged;

(2) Aviation fuel or oil is sold;

(3) Space is rented;

(4) Goods or services are sold; or

(5) Any other activity is carried on for remuneration.

(c) “Public use airport” means any publicly or privately owned airport that is open to flight operations by the public.