This is the 3141st most frequent Russian word.
летит
"Летит" means "is flying."
Here, 'летит' indicates the action of flying performed by the bird.
Птица летит высоко в небе.
The bird is flying high in the sky.
In this sentence, 'летит' refers to the act of flying, used metaphorically to describe a person traveling by airplane.
В самолёте летит моя подруга.
My friend is flying in the airplane.
Here, 'летит' describes the movement of a leaf being carried by the wind, illustrating the action of flying or being airborne.