zibin he no hurikae wo kakuninsuru.

It is read:

じびん への ふりかえ を かくにんする

In normal Japanese writing, it would usually appear without spaces:

次便への振替を確認する。

A couple of useful readings here are:

• 次便 = じびん
• 振替 = ふりかえ
• 確認する = かくにんする

次便 is a compact, formal way to say the next flight or the next service/departure.

• 次 = next
• 便 = flight, service, shipment, dispatch, etc., depending on context

So in an airline context, 次便 means the next flight.

Why not 次の便?
Both are possible, but they sound a little different:

• 次便 = more formal, concise, often used in business, announcements, systems, or written procedures
• 次の便 = more conversational and straightforward

So this sentence sounds like something from a manual, staff note, checklist, or customer-service process.

This is one of the most important grammar points in the sentence.

へ shows direction or destination: to the next flight.

But here, that whole idea needs to modify the noun 振替. To connect a particle phrase to a noun, Japanese often uses の.

So:

• 次便へ = to the next flight
• 次便への振替 = transfer/rebooking to the next flight

You can think of への here as:

to + linking to a noun

So the structure is:

[destination] + への + [noun]

Examples:

• 学校への道 = the road to the school
• 会社への連絡 = contact to the company
• 次便への振替 = transfer to the next flight

Here, 振替 means a transfer, switch, or rebooking from one flight to another.

In travel contexts, it often refers to moving a passenger from the original flight to a different one, especially the next available one.

It comes from the verb 振り替える, which means to transfer or switch something over.

In this sentence, 振替 is being used as a noun:

• 振り替える = to transfer / to switch
• 振替 = transfer / rebooking

In English, depending on context, this could be translated as:

• transfer
• rebooking
• change to another flight

Both forms are related, but 振替 is a very common formal written form, especially in business, travel, and administrative language.

You may also see:

• 振り替え
• 振替
• 振り替える
• 振替える

In practical usage:

• 振替 often looks more formal and compact
• 振り替え can feel a bit more transparent to learners because the okurigana make the word structure clearer

So in a phrase like this, 次便への振替, the kanji-heavy form is very natural.

Because 振替 is the thing being confirmed.

The verb is 確認する = to confirm / to check

So:

• 振替を確認する = confirm the transfer / check the rebooking

The particle を marks the direct object of 確認する.

A simple breakdown is:

• 次便への振替 = the transfer to the next flight
• を = object marker
• 確認する = confirm

So the full structure is:

Confirm [the transfer to the next flight].

Yes, it can function as a full sentence, but in many contexts it may sound like a procedural statement, memo, checklist item, or instruction rather than ordinary conversation.

The dictionary form can be used in Japanese for:

• neutral written statements
• procedures
• manual-style instructions
• headings or task descriptions

So 次便への振替を確認する。 can feel like:

• confirm the rebooking to the next flight
• check the transfer to the next flight

In everyday conversation, you might more often hear something like:

• 次便への振替を確認します。 = I will confirm the transfer to the next flight.
• 次便への振替を確認してください。 = Please confirm the transfer to the next flight.

That is normal in Japanese. The subject is omitted because it is understood from context.

Depending on the situation, the unstated subject could be:

• a staff member
• the speaker
• the listener
• a company or system process

Japanese often leaves out subjects when they are obvious from the situation. So this sentence focuses on the action itself, not on who does it.

A native speaker would figure out the subject from context such as:

• a workplace manual
• a customer-service interaction
• an airport procedure
• a to-do list

Sometimes yes, but there is a nuance.

Both に and へ can mark a destination, and with verbs like 振り替える, both can appear depending on phrasing.

Compare:

• 次便に振り替える
• 次便へ振り替える

Very roughly:

• に often feels more like the target/result
• へ often feels more like direction toward that destination

In noun phrases like this, 次便への振替 is very natural and common in formal Japanese.
You may also encounter 次便への振り替え or similar variations.

So へ is not strange here at all; it fits the formal written style well.

Not usually in exactly this form. It sounds quite formal and task-oriented.

In conversation, a speaker would often use a fuller sentence such as:

• 次の便への振り替えを確認します。
• 次の便に振り替えられるか確認します。
• 次の便への変更を確認します。

The original sentence feels more like:

• a note
• a work instruction
• a system action label
• a procedural step

So it is natural Japanese, but it belongs more to formal written or business contexts than casual everyday speech.

確認する often covers both check and confirm in English, depending on context.

Its core meaning is something like:

• verify
• make sure
• confirm after checking

So in this sentence, it could mean:

• check whether the transfer to the next flight has been arranged
• confirm the rebooking to the next flight
• verify the next-flight transfer details

Japanese 確認する is very common in business and service situations because it sounds objective and professional.

So even if the English translation varies, the Japanese nuance is basically: make sure the transfer to the next flight is correctly arranged or understood.