How do wings generate lift when flying upside down?
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[THIS](http://airfoiltools.com/airfoil/details?airfoil=n0012-il) is the page for a website called AirfoilTools, for an airfoil called the NACA0012. Look at the graph labeled Cl v Alpha. This is Coefficient of Lift vs angle of attack. Look at the y axis, and you’ll note that the numbers can go negative. Literally, if you tilt the wing down, you will generate a force of lift towards the bottom of the plane.
If you fly upside down, and tilt your wing such that you are generating lift *towards the bottom of the plane*, but the bottom of the plane is pointed *towards the sky*, you are generating lift in the upwards direction. Enough of that, and you can fly.
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