Why do planes fly over Greenland when crossing the Atlantic?

Related questions

1. Why are flight paths curved?
2. How does the great circle route work?
3. Do planes fly over Tibet?
4. Why do we not feel earth spinning?
5. Can planes fly over North Pole?
6. Why are eastbound flights faster?
7. Why do planes not fly over Antarctica?
8. Why do planes not fly over the Pacific?
9. What is great circle in aviation?
10. Why is great circle the shortest distance?

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20. #captain
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23. #route