Let's make this very simple. Imagine a fly in a car. As the flies around inside the car, it will have an airspeed. If you now start to drive the car, will you change the fly's airspeed? No. Will the fly even know you have started to move? Probably not. Always the fly's airspeed is that which it makes through the air inside the car and it's groundspeed it that which it makes across the ground over which the car takes it.
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