hikouki ga buji ni kuukou ni tsuita to kiite, anshinshimashita.

I felt relieved when I heard the plane arrived safely at the airport.

Breakdown of hikouki ga buji ni kuukou ni tsuita to kiite, anshinshimashita.

• に: destination particle
• が: subject particle
• と: quotative particle
• 空港くうこう: airport

Questions & Answers about hikouki ga buji ni kuukou ni tsuita to kiite, anshinshimashita.

Why is が used after 飛行機 instead of は?

が marks 飛行機 as the subject of 着いた.

So the core part is:

• 飛行機が着いた = the plane arrived

Using が sounds natural here because the sentence is reporting a specific event: the plane’s safe arrival.

If you used は instead, it would sound more like you are setting the plane up as the topic and then saying something about it. That is possible in some contexts, but が is the most straightforward choice for this sentence.

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What does 無事に mean, and why does it have に?

無事 means safety, without problems, or safely depending on context.

In this sentence, 無事に means:

• safely
• without incident
• all right

The に turns 無事 into an adverb-like expression modifying the verb 着いた.

So:

• 無事に着いた = arrived safely

This is very common in Japanese:

• 静かに話す = speak quietly
• きれいに書く = write neatly
• 無事に終わる = end safely / without problems

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Why are there two に particles in the sentence?