This Nordic Aviation group should be seen as Estonian Air 2.0. Estonian Air was leasing from BMI and in essence, all that happened was that another company took over that lease.
Over the last few months, the single ERJ145 that was there was flying routes as needed by load factor I think. I've seen them do the Amsterdam flight, a lot of Oslo, some Brussels I believe and maybe even Arlanda once or twice.
Tonight I know at least one of the two BMI aircraft currently in Tallinn (I think it's G-RJXB & C) was flying to Brussels as Adria 7177. That's the Estonian Air flight number with a 7 in front to keep things easy for Estonian 2.0
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