Why do pilots fly over Greenland when flying from NY to London instead of in a straight line?

This route is called a geodesic or great circle. While map projections distort these routes confusing passengers, the great circle path is the shortest path between two far locations. This is why pilots fly polar routes saving time and distance. And this is why pilots often fly over Greenland.



Pilots follow a "straight line" in 3D space called a Great Circle Route, which often appears as a curve on flat maps like the Mercator projection. Because the Earth is a sphere, the shortest distance between New York and London actually passes over the northeastern U.S., Canada, and the southern tip of Greenland. This route is not a detour; it is the most efficient path, saving roughly 500 to 800 miles compared to a horizontal line across the mid-Atlantic. In 2026, airlines use sophisticated AI-driven flight planning to adjust these paths slightly based on the Jet Stream—high-altitude winds that can provide a "tailboost" or cause a "headwind." While flying over Greenland is the shortest physical distance, a pilot might shift the route further south if the Jet Stream is exceptionally strong, but the Great Circle principle remains the foundation for almost all long-haul navigation.

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