https://extranet.liikennevirasto.fi/latauspalvelu

From the dataset abstract

Air traffic network-product is a link-knot routing dataset compliant with INSPIRE requirements. It includes f.ex. flight routes and aerodromes. Data shall not be used for operational flight activities or flight planning.

INSPIRE Air Traffic Network-product includes spatial information of air traffic network in accordance with the INSPIRE Directive. The data has been retrieved from the EAD database maintained by Eurocontrol. Information is updated regularly but is not constantly up to date. Data can be used for purposes that are in accordance with the INSPIRE Directive, but shall not be used for operational flight activities or flight planning. ANS Finland www.ais.fi –site provides information for operational flight activities or flight planning

Source: Air Traffic Network