If it's explained, varifiably, duplicated untold millions of times without variation to the basic concept (aerodynamics) .. it's not a theory.
Yes, it IS. The first part of your sentence is the definition of theory. Theory is a strong word. You mean it is not a hypothesis. People in aviation take a course called something like "Theory of Flight". Like this: http://www.aerodiamond.com/flight_theory.htm
Or this: http://www.aviation-history.com/theory/index-theory.html
See my post #22.
I ran across a website with this heading: "United Flight 93 Crash Theory Home Page - The Real Story of Flight 93". Incorrect use of the word 'theory' in the scientific sense. They should have used 'hypothesis'.
You are confusing the fact of flight with the theory of flight; the former is observed, the latter explains how and why it occurs.
Same with evolution; there is the fact of evolution (change occurs from generation to generation) and the theory that explains how and why that change occurs.