Delta/Air France (business) ARN-JFK-CPH: ~£1300 GBP
Routing has to be multi-city.
Not sure how far out it goes, but its available for the all the May/June dates I tested.
Can be a bit cheaper on momondo. (I booked £1250). Can also book direct with KLM/AF. Delta marketed looked most expensive, but still pretty inexpensive.
