Flight schools and high schools perpetuate the myth that airplane lift is based on the application of the Bernoulli principle to a cambered airfoil. If that were the case, airplanes could not fly upside down or airplanes with a symmetrical airfoil could not fly at all. Airplanes sometimes even fly on their side. Part of this theory relies on the assumption of the simultaneous arrival of air molecules at the trailing edge of the wing. If that is the case, the molecules above the wing move faster than those below (because they travel farther), thus in effect creating less air pressure on top which then leads to lift.
Has there ever been an empirical investigation of this simultaneous arrival of the air molecules at the trailing edge? Could one devise an experiment that unambiguously demonstrates or disproves this assumption?

Bernoulli's principle is a major part of the way in which an airplane flies. However, Newtonian physics and lift from the body of the plane itself also play significant roles in the flight of airplanes.

PS: The molecules on both sides of the wings don't have to realign as they did before. There is no science that says the molecules simultaneously arrive at the trailing edge of the wing.

There may be no science about the simultaneous arrival of the air molecules, however, it is a major article of faith in the popular explanation of lift. According to experts in aerodynamics, the Bernoulli principle is not a "major" factor in lifting the wing. Newton's action and equal but opposite reaction plays a larger part (third law). Think about what makes a kite fly. My main point about my posting was to debunk the popular acceptance of the "equal transit" time and and to find out how it could be disproven experimentally.