FW207,
Your absolutely right when speaking 'aerodynamically'.
However, when you state "Wind GUSTS will of course have an effect." you've blown your own argument out of the water. If the aircraft is flying in a 'packet of air' and it's IAS can vary because of wind gusts, it is its inertia (or momentum) which permit this.
Just because something leaves the ground, doesn't mean that it leaves the Laws of Physics behind.
J