This is the 3675th most frequent Turkish word.
uçan
"Flying."
Here 'uçan' is used as a present participle to describe 'kuşları' (birds) that are performing the action of flying.
Uçan kuşları izlemeyi seviyorum.
I enjoy watching the flying birds.
In this sentence, 'uçan' is used as an adjective to describe 'balonlar' (balloons) that are in the state of ascending.
Uçan balonlar gökyüzüne doğru yükseliyordu.
The flying balloons were rising toward the sky.
Here, 'uçan' is utilized to modify 'bir halı' (a carpet), indicating the kind of carpet that can fly.