The aeroplane flies in a block of air. Its airspeed is its speed through that block.
The block of air with the aeroplane in it might be travelling over the ground at absolutely any speed, or not. That has absolutely no effect on the airspeed of the aeroplane, but does directly affect the aeroplane's ground speed.
So in the air, a steady wind has NO effect whatever on an aeroplane in flight other than affect its groundspeed.
However, because it affects the aeroplane's groundspeed, wind becomes very important when transitioning from air to ground or vice versa (landing and take off). Groundspeed is only a factor for the pilot to bother about in landing, takeoff, and navigation. But he can ignore it for all else.