✈️ Planes and sky

An airport is a big place where planes take off and land.

From way up high, you can see fluffy white clouds and tiny houses below.

You pack clothes, your toothbrush, and maybe a favourite toy in your suitcase.

A plane makes a loud, rumbling roar as it flies up into the sky.

An airplane's wings are specially curved on top and flatter on the bottom, and as the plane speeds forward, air rushing over that curved shape creates a lifting force strong enough to hold the entire plane up in the sky. Powerful engines push the plane forward fast enough for this lift to build up, which is why planes need a long runway to speed up before they can actually take off. Pilots can also tilt parts of the wings to control exactly how much lift is created, which lets them climb higher, descend, or turn smoothly during flight.

Wings are the single most important part of a plane for actually flying, since their curved shape is what creates the lifting force that holds the entire aircraft up in the air. Wings also hold important equipment inside them, including fuel tanks, and often the engines themselves are mounted directly underneath or on top of the wings. Small moving flaps along the edges of the wings let pilots fine-tune lift and control during takeoff, landing, and turns, adjusting exactly how the air flows around the wing.

Instead of fixed wings, a helicopter has large spinning rotor blades on top that create lift straight upward by pushing air downward as they spin extremely fast. Because those spinning blades generate lift directly above the helicopter, it can rise straight up into the air without needing to build up forward speed along a long runway first. This ability to take off and land straight up and down lets helicopters use tiny spaces, like rooftops or small clearings, that a regular airplane could never safely use.

A hot air balloon rises because the air trapped inside its huge fabric envelope is heated by a burner, and hot air is lighter than the cooler air surrounding it outside the balloon. As the balloon fills with enough hot, lighter air, it becomes light enough overall to float upward, carrying the basket and passengers along with it. To come back down, the pilot simply lets some hot air escape or lets the air inside cool down, which makes the whole balloon heavier again so it slowly sinks back toward the ground.