Airlines established in Finland 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. Government authorisation is required to engage in commercial aviation. Air cabotage is reserved to national 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))

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"Section 121 - Air services:
An operating licence under the Air Services Regulation is needed for carrying passengers, cargo or mail by air for remuneration or hire (air services).
The Finnish Transport Safety Agency shall issue an operating licence on application.
[...]

Section 122 - Air services on routes within the European Economic Area with departure or destination in Finland:
Air services on routes within the European Economic Area with departure or destination in Finland require an operating licence issued in an EEA member state. The Finnish Transport Safety Agency may, in an individual case or based on international obligations binding on Finland, also grant a licence to operate such services to an operator not holding an operating licence as referred to above."
(Act on Transport Services (320/2017), Sections 121 and 122 [Prior Chapter 12, Sections 2 and 3] [unofficial translation])
Regulation (EC) No 1008/2008 on common rules for the operation of air services in the Community, Article 4(f)
Act on Transport Services (320/2017), Sections 121 and 122 [Prior Chapter 12, Sections 2 and 3]
[<a href="https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A02008R1008-20201218">Regulation</a>],[<a href="https://www.finlex.fi/en/laki/kaannokset/2017/en20170320_20180731.pdf">Act</a>]