All executive officers of a Korean airline company must have Korean citizenship.
"Article 10 (Restrictions on Aircraft Registration)
(1) No aircraft owned or leased by any of the following persons shall be registered: Provided, That the foregoing shall not apply to an aircraft which citizens or corporations of the Republic of Korea have the right to lease and use:
1. A person who is not a citizen of the Republic of Korea;
2. A foreign government or foreign public organization;
3. A foreign corporation or organization;
4. A corporation at least half of whose shares or equity stakes are owned by a person falling under any of subparagraphs 1 through 3 or whose business is substantially controlled by such person;
5. A corporation whose representative in its business registration certificate is a foreigner or in which foreigners account for at least half of the number of its executives in the business registration certificate.
(2) Notwithstanding the proviso to paragraph (1), no aircraft with the foreign nationality shall be registered.[...]" (Aviation Safety Act (No. 14116 of 2016), last amended by Act no. 17463 of 2020, Article 10 [unofficial translation])
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"Article 9 (Grounds for Disqualification for Granting License to Operate Domestic Air Transport Services and International Air Transport Services)  
The Minister of Land, Infrastructure and Transport shall not grant a license to operate domestic air transport services or international air transport services to any of the following persons:
1. A person who falls under any of the subparagraphs of Article 10 (1) of the Aviation Safety Act; [...]
6. A corporation that has a person as its executive officer falling under any of subparagraphs 1 through 5.[...]" (Aviation Business Act (No. 14115 of 2016), last amended by Act No. 17462 of 2020, Article 9 [unofficial translation])
Aviation Safety Act (No. 14116 of 2016), last amended by Act no. 17463 of 2020, Article 10
Aviation Business Act (No. 14115 of 2016), last amended by Act No. 17462 of 2020, Article 9
[<a href="https://www.law.go.kr/LSW//lsInfoP.do?lsiSeq=191167&lsId=012524&chrClsCd=010202&urlMode=lsInfoP&viewCls=lsInfoP&efYd=20170330&vSct=&ancYnChk=undefined">Act</a>],[<a href="https://www.law.go.kr/LSW//lsInfoP.do?lsiSeq=191167&viewCls=engLsInfoR&urlMode=engLsInfoR&chrClsCd=010203#0000">Act_Eng</a>],[<a href="https://www.law.go.kr/LSW/lsEfInfoP.do?lsiSeq=200240#">Act</a>],[<a href="https://elaw.klri.re.kr/eng_service/lawView.do?hseq=53100&lang=ENG">Act_Eng</a>]