[bbojan]

> How do you explain airplanes that can fly with wing with symmetrical cross-section profile?

> How do you explain airplanes flying upside-down?

Angle of attack is what causes lift. If you have a surface angled against the relative wind, it will produce lift.

[dan_hawkins]

I know all of that. I wanted to provoke parent commenter to let them see that the Bernoulli effect doesn't explain my two examples.