No, I'm not, Doc - there are many different theories and explanations about flight - how a plane takes off and stays in the air.
Many of these theories are contradictory, and many scientists have said that although they have the theory they still don't understand why it actually happens. I watched an in depth debate on the television some years ago which was fascinating. This article is interesting, although it is only one man's opinion:
http://www.bestaviation.net/art_what_makes_an_ airplane_fly.asp