Planes have flashing lights so other planes can see them at night.
One wing has a red light and the other has a green light. The lights help pilots know which way each plane is pointing.
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Airplanes have big wings that help them stay up in the sky.
Helicopters can go straight up, straight down, and even hover in one spot.
A hot air balloon floats because the warm air inside is lighter than cool air.
A glider is a plane with no engine that rides on the wind.
The Airbus A380 is the biggest passenger plane, with two full floors of seats.