The earth pulls down on the plane...

....and the plane pulls up on the earth.

The air pushes up on the plane and the plane pushes down on the air;
essentially transferring the earth's continuous flow of downward
momentum acting on the plane to a much greater mass of air.

That air keeps that downward momentum, diffusing it through more and
more volume...

....until it eventually transfers it back to the Earth; countering the
aircraft's upward pull on it.

I'm willing to send that to any Ph.D. in Aeronautics that anyone cares
to name and post the answer back here.

Anyone game?

--
Alan Baker
Vancouver, British Columbia
http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg