The globe’s shortest path can look like a detour
A flat map makes New York and London look as if they lie nearly straight across from one another. But an airplane travels over a curved Earth. The shortest route between two points on a sphere is part of a great circle—the equivalent of drawing a straight line on a globe. When that route is transferred to many familiar flat maps, it bends northward on the screen, sometimes toward Greenland.
The apparent detour is a map effect, not a climb toward the pole for its own sake. Flat maps distort distances and directions because they must stretch a round surface onto a rectangle. On a globe, the same route looks much less surprising.
The shortest route is only a starting point
Airlines and dispatchers do not simply trace one fixed line. Winds can make a longer path faster: aircraft may seek helpful tailwinds or avoid strong headwinds. Weather, air-traffic control, and restrictions on where aircraft may fly can also shape the route. Across the North Atlantic, routes are adjusted to conditions, so two flights between the same cities may take different paths.
That means a line passing near Greenland can reflect both the geometry of the Earth and the day’s practical flying conditions. It is not necessarily the exact shortest route, nor does every New York–London flight follow the same track.
Why the map remains useful
The route shown on a screen is a projection—a translation of the globe onto a flat display. Its curve is a reminder that the map is not the territory: a path that looks like a wide sweep can be an efficient crossing when measured on the Earth itself. The next time a transatlantic flight arcs north on a map, compare it with a globe; the apparent kink often becomes the more direct-looking line.
