One is straight line or curve on the local plane. The other is the great circle flight path on the earth surface.

预定的飞行轨迹可以有两种规划方式，一是近似在当地切平面上的直线或曲线；

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Or, see the great island by boat on a Circle Line day cruise, a World Yacht dinner cruise, or even the free Staten Island Ferry, where you sail right past Lady Liberty.

BBC: Romantic winters of New York