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Why do planes fly to America in an arch?
Many of you will have looked at an aircraft map such as Flightradar24 and wondered why the planes that leave the UK and Europe in an arch up towards Greenland and back down.
This is known as the great circle.
The earth revolves on its axis, forcing the middle to bulge out slightly. The curvature of the earth and its extra equatorial width mean that curving towards the poles is a shorter distance than flying in a straight line