Which principle explains how an airplane flies?

Bernoulli's principle correctly explains how airplanes generate lift. The principle states that as the speed of a fluid (air) increases, its pressure decreases. Airplane wings are designed with a curved upper surface that causes air to move faster over the top than beneath, creating lower pressure above the wing and higher pressure below, resulting in an upward lift force. The other options are incorrect: Brownian motion describes random particle movement, Fizeau dealt with light speed in moving media, and Schrödinger's principle relates to quantum mechanics.