But yes, Copenhagen on its own, without connections on OW throughout the Nordic region/Baltics, is definitely not going to get a ton of traffic. Makes much more sense for AA to enlist the help of BA and fly RIX/ARN/TLL/VNO - LHR - US.
I'm a bit confused-- didn't think that BA flies from LHR to VNO nor TLL? (i.e. only to/from RIX in the Baltics)
Would be happily proven wrong, of course...