Why do airplanes fly and how do their wings generate lift?

Airplanes fly because their wings are shaped just right to push air down and pull themselves up.

Imagine you're on a slide at the park, when you jump off, you go whoosh down the slide because gravity pulls you. Now think of airplane wings like your hands pushing air as you go down that slide. When an airplane moves forward, its wings push air down and backward. In return, the air pushes the airplane up and forward, that’s how it flies!

The top of a wing is curved, while the bottom is flatter. As air flows over the curved top, it has to travel farther than the air below. This makes the air on top move faster, which means it pushes less hard against the wing. Meanwhile, the slower-moving air underneath pushes harder, creating an upward force called lift.

It's like when you blow across the top of a bottle cap and it lifts up, only on a much bigger scale! That’s how airplanes stay in the sky and keep moving forward.