Which physical principle explains the ability of airplanes to fly?

Bernoulli's principle

Daniel Bernoulli, in the 18th century, discovered a fundamental principle of fluid dynamics that explains how airplanes can fly. This principle states that in a fluid flow, an increase in the fluid's velocity occurs simultaneously with a decrease in its pressure. It's this relationship between air speed and pressure that allows an airplane's wings to generate lift, by creating a pressure difference between the top and bottom of the wing. Thus, Bernoulli's principle is essential to aeronautics and our understanding of fluid-related phenomena.