Previously discussed in the LH forum: http://www.flyertalk.com/forum/lufth...why-route.html

CPH-ORB used to be operated by Estonian. When they folded, Nordica was founded, and they used Adria aircraft and AOC to operate the route. The CPH-GRQ route was added later on, making the route ORB-CPH-GRQ.
A couple of months ago, LOT took over the ops, and they use BMI aircraft for this route.
So it's a Nordica route operated by LOT using BMI aircraft. Not complicated at all.