How does the force in fluids allow heavy airplains to fly?

Airplanes fly due to the principles of fluid dynamics, specifically Bernoulli's principle and Newton's third law of motion. As air flows over and under the wings, the shape of the wings (airfoil) creates a difference in air pressure, generating lift. This lift counteracts the weight of the airplane, allowing even heavy planes to ascend and maintain flight. The engines provide thrust, propelling the airplane forward and enhancing the airflow over the wings.