one more go - I'm pretty sure this won't work either...
Say you are in a C-5A flying along at 350 KT. What is the airspeed INSIDE the aircraft? If you were flying a little R/C helo inside the airplane, would it have a tailwind? Of course not. It would fly exactly the same inside the moving C-5A as it would inside a parked C-5A.
Wow - I don't really even get that one
Oh well, I'm done.