Speed of the aircraft relative to the ground is different from the speed that shows the speed indicator on the plane.
First, the plane flies through the air, regardless whether the air moves out or not.
That is, the plane flies inside a certain air, so the instrument displays the speed relative to the surrounding air.
If the air is moving relative zamli, the speed of the aircraft relative to the ground changes, the speed relative to the air remains the same. It is like a boat in the current. If the flow and the boat is worth, then nothing changes. If the flow is moving and the boat is not moving in the flow, it will still go with the flow relative to the shore. If the boat is adrift with the engine, the water speed is increased by the flow velocity and the velocity is obtained relative to the shore - just as the task of stredney school.
If the boat is going against the flow, and the flow velocity is equal to the speed of the boat , the boat relative to the shore may remain stationary.
And with the aircraft, but instead will wind flow, and instead shore will land.