Online check-in was already possible for flights departing from Berlin, Brussels, Kiev, Munich and Vienna, and all flights from Tallinn. Work with other destinations is ongoing. Further information about checking-in is available HERE.
In Stockholm, Oslo, Trondheim, Vienna and Munich, it is also possible to check-in using self-service kiosks, and it is of course still possible to check-in at Nordica/Adria Airways desks in all airports.
Enjoy your travels!