Airlines established in Slovak Republic must be majority owned and effectively controlled by EU states and/or nationals of EU states, unless otherwise provided for through an international agreement to which the EU is a signatory. In principle, domestic air transport may be performed only by domestic air carriers.
"Article 4 - Conditions for granting an operating licence:
An undertaking shall be granted an operating licence by the competent licensing authority of a Member State provided that: [...]
(f) Member States and/or nationals of Member States own more than 50 % of the undertaking and effectively control it, whether directly or indirectly through one or more intermediate undertakings, except as provided for in an agreement with a third country to which the Community is a party; [...]" (Regulation (EC) No 1008/2008 on common rules for the operation of air services in the Community, Article 4(f))
------------------------
"§ 37 Air transport performed by domestic air carriers
(1) Air transport for remuneration 1 ) may be performed by a domestic air carrier only on the basis of a license granted by the Ministry. The license granted is non-transferable.
(2) The applicant for a license must prove [...]
d) in the case of a natural person, having the citizenship of the Slovak Republic or another Member State of the European Union (hereinafter referred to as the "Member State") and a permanent residence in the Slovak Republic; in the case of a legal person, that
1. has its registered office or organizational unit in the Slovak Republic and the place of entry in the Commercial Register in the Slovak Republic,
2. the majority of property rights are owned by natural persons who have the citizenship of the Slovak Republic or another Member State, or legal entities domiciled in the Slovak Republic whose majority of property rights are owned by natural persons who have the citizenship of the Slovak Republic or another Member State state,
3. effective control is also carried out by those natural or legal persons,
[...]
§ 38 Domestic air transport
Domestic air transport may be performed only by a domestic air carrier, unless international agreements provide otherwise or unless the Ministry grants an exemption.[...]" (Aviation Act (143/1998 Coll.), last amended by Act no. 312/2020 Coll. of 21 October 2020, §§ 37 and 38 [google translation])
Regulation (EC) No 1008/2008 on common rules for the operation of air services in the Community, Article 4(f)
Aviation Act (143/1998 Coll.), last amended by Act no. 312/2020 Coll. of 21 October 2020, §§ 37 and 38
[<a href="https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A02008R1008-20201218">Reg</a>],[<a href="https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1998/143/20200801.html">Act</a>]