This airplane flies at subsonic speed.

I am going to Tokyo by airplane tomorrow.

The speed of sound is about 343 meters per second in the air.

He was watching the flight of the airplane.

The bird is flying in the sky.

He was playing by folding a paper aeroplane.

This new jet can fly at supersonic speeds.

This insect belongs to the subfamily of stink bugs.

He is considered a second-rate student at school.

The subtropical climate is humid and hot all year round.