Originally Posted by
Steve_Hun
Since you seem to be rather critical for "interesting" details, let me point it out, that HEL-ARN is not a domestic connection, but intra Schengen one. The EU is not (yet) one country.
It looks like a domestic flight, feels like a domestic flight and behaves like a domestic flight, therefore it is a domestic flight. You don't need to pass immigration, and no one checked my passport even boarding! Even on the return BMA - HEL flight my passport wasn't opened even once.