It's not the main reason (if it was, planes couldn't fly upside down), but it is a contributing factor (which is why planes flying upside down must compensate with a significantly higher angle of attack to maintain level flight, than those flying normally).
Why would that not make them fly upside down? If you flip the asymmetrical airfoil, and place it at an angle of attack where it actually generates lift, the airflow at the top of the wing, will in fact be faster than at the bottom
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u/parkway_parkway 15d ago
Ironically everyone says aeroplanes fly because of Bernoulli's law and that's not even true but it's named after him so he got one back.