At least 10% of the shares of an airport service company must be owned by citizens and citizen-owned companies.
2. (1) In this Act, unless the context otherwise requires—[...]
“ airport services ” means services provided at an aerodrome which are essential for safe air traffic operations and includes but is not limited to the following: (a) ground handling of civil aircraft, passengers, baggage, freight or mail;
(b) fire fighting; (c) medical services for flight crew members and passengers; (d) the supply of civil aircraft with fuel and lubricants; (e) protection services against acts of unlawful interference to civil aircraft; (f) in flight catering services; (g) conveniences for passengers and other airport users; and (h) services by self-service handling provider;[...]
“ air service ” means any scheduled air service performed by aircraft for the public transport of passengers, mail or cargo; [...]
“ citizen ” means— (a) an individual who is a Zambian citizen; (b) a partnership of which each member is a Zambian citizen; or (c) a citizen owned company, citizen empowered company or citizen influenced company, as defined in the Citizens Economic Empowerment Act,
2006;
[...]
PART IV - AIR SERVICES [...]
29. (1) An application for an air services permit shall be made to the Minister in a prescribed form and shall be accompanied with such fees as may be prescribed in accordance with section forty-four.
(2) An application for an air services permit shall— [...]
(c) comply with sections fifty-three, fifty-four, fifty-eight and fifty-nine of the Civil Aviation Authority Act, 2012.
[...]
105. (1) A person shall not provide airport services without a permit for the provision of airport services issued under this Part.
(2) A commercial entity shall not be granted a permit for provision of airport services unless—
(a) its principal place of business and its registered office are located in Zambia;
(b) a minimum of ten percent of the commercial entity’s shares are owned by citizens; and
(c) it pays the prescribed fee for issuance of the permit. 
[...]
113. If the Minister, in consultation with the Authority, determines that other countries have not provided providers of airport services who are citizens of Zambia with—
(a) the same treatment that providers of airport services of those countries have in Zambia; or
(b) the same treatment received by providers of airport services from third parties;
the Minister shall wholly or partially cease the obligations arising from those countries.[...]" (CIVIL AVIATION ACT, 2016)
CIVIL AVIATION ACT, 2016
[<a href="https://www.parliament.gov.zm/sites/default/files/documents/acts/The%20Civil%20Aviation%20Act,%202016.pdf">Act</a>]