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が空を飛んで

fly in the sky

→ が
phrase Rare #36,882
fly in the sky Used as part of a sentence describing something flying through the sky. The particle が marks the subject, and 飛んで is the te-form of 飛ぶ, often followed by いる or another verb.
JA: 飛行機が空を飛んでいる。
EN: An airplane is flying in the sky.

鶴が空を飛んで行く

A crane is flying across the sky.

— 鶴は翔んでゆく (1957)