How does the great circle route work?

Related questions

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2. Why do planes fly in a curved path?
3. Why do planes not fly over the Pacific?
4. Is the Concorde still flying?
5. Why do planes fly over Greenland when crossing the Atlantic?
6. Why are eastbound flights faster?
7. Why do we not feel earth spinning?
8. Why don't planes fly over the Atlantic?
9. Why do planes not fly directly over the Pacific Ocean?
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Tags

1. #surface
2. #between
3. #lines
4. #straight
5. #circle
6. #string
7. #called
8. #route
9. #easier
10. #although
11. #cities
12. #points
13. #great
14. #airliners
15. #curved
16. #using
17. #routes
18. #shortest
19. #earth
20. #globe