Dave, the earth dropping away and the plane ascending from the ground are the exact same things, just from two different perspectives.
The plane is moving relative to the earth, but relative to the plane, the earth is the object that is moving.
I suggest you read this, Dave.
http://www.aviastar.org/theory/basics_of_flight/flight.html
:deadhorse:
Dave, go read the link I posted above that talks about how gravity works.
See my previous comment. And go read those links.
And the wikipedia link above for Newton's laws of motion.