So I have been back from the WHR for 11 days now, so here is the start of my report.
We were scheduled to fly on Baltic from Belgrade to Riga and then on to Helsinki on September 1st.
We arrived at the airport and proceeded to go to check in, but there was no check in. We then looked on the departure screen for our flight and it was not there. After an inquiry at the information desk, we found out that Baltic does not operate flights to Helsinki via Riga between September and February, even though they let us book a flight for September 1st. It seems they had been trying to inform us of this without success. So they had an obligation to give us an alternative flight and booked us on an Austrian Airlines flight through Vienna for the next morning. This did not create a big problem with our Finland schedule so we were happy and we had a better flight.
We arrived in Helsinki mid afternoon the next day instead of late evening the day before and apart from the fact that our bags were delivered to another terminal everything was good. I was in Finland for the first time ;)