I always thought it was strange of Air Greenland to operate flight to Baltimore back in early 2000. Seriously it does not seem to be a flight suited to transit passengers or trying to attract passengers from the larger capitol catchment areas. However, after watching Walter Mitty I have some ideas and here goes:
Air Greenland
Kangerlussuaq->Toronto->New York, JFK- A330 (thin routes, 2x weekly)
Kangerlussuaq->London Heathrow- A330 (daily)
Kangerlussuaq->Frankfurt- A330 (1x weekly)
SAS Scandinavian Airlines
Kangerlussuaq->Oslo->Copenhagen-B738 (daily)
First Air
Ottawa->Iqaluit->Kangerlussuaq-B732