zibin he no hurikae wo onegaisuru.

次便 means the next service/next flight/next departure, depending on context.

• 便（びん） is used for scheduled services such as flights, buses, ferries, and deliveries.
• 次便 is a compact, formal-sounding way to say the next one.
• 次の便 means the same thing and is often easier for learners to understand.

So:

• 次便 = next flight/service
• 次の便 = next flight/service

In announcements, customer service, tickets, and written procedures, 次便 can sound more concise and businesslike.

This is a very common pattern:

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

Here is how it works:

• へ shows direction or destination: to
• の turns that phrase into something that can modify a noun

So:

• 次便へ by itself means to the next flight
• 次便への振替 means transfer to the next flight

You can think of への as linking the destination phrase to the noun that follows.

Similar examples:

• 日本への旅行 = a trip to Japan
• 会社への連絡 = contact to the company / contacting the company

In this sentence, 振替（ふりかえ） means transfer, rebooking, or switching to another service.

In transportation contexts, it often means moving a passenger from one flight/train/bus to another.

So 次便への振替 means something like:

• transfer to the next flight
• rebooking onto the next service
• switching me to the next departure

The exact English wording depends on context, but the Japanese idea is the same.

Because お願いする takes the thing being requested as its object.

In this sentence, the thing being requested is:

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

So:

• 次便への振替をお願いする = to request a transfer to the next flight

Structurally:

• [thing requested] を お願いする

Other examples:

• 確認をお願いする = request confirmation
• 対応をお願いする = request assistance/action
• 返金をお願いする = request a refund

So the を marks what you are asking for.

Not exactly. お願いする literally means to request or to ask for.

Depending on context, it can sound like:

• I request ...
• I’d like to ask for ...
• Please do ...

But grammatically, it is a verb meaning to make a request.

For example:

• 振替をお願いする = to request a transfer
• よろしくお願いします is different in nuance and is more like a fixed polite expression

So in this sentence, お願いする is not just a standalone please. It is the main verb: to request.

The plain form can appear for several reasons:

1. Dictionary/headline style
   Written Japanese often uses plain form in notes, forms, examples, manuals, or summaries.

2. Quoted or reported content
   It may represent the basic action: request a transfer to the next flight.

3. Less directly conversational
   In actual speech to staff, you would more naturally say:

   • 次便への振替をお願いします。
   • 次便への振替をお願いしたいです。

So お願いする here may sound like a neutral written form rather than a fully polite spoken sentence.

Not in this exact plain-form shape, unless it is being used as:

• a note
• a memo
• a written example
• a statement in reported style

In real conversation, a customer would usually say something more polite, such as:

• 次便への振替をお願いします。
• 次便への振替をお願いできますか。
• 次便に振り替えていただけますか。

So the sentence you have is grammatically fine, but it feels more like a base form or written expression than a finished polite spoken request.

Yes. That is a very natural alternative.

Compare:

• 次便への振替をお願いする

  • literally: request a transfer to the next flight
  • more noun-based, formal/businesslike

• 次便に振り替えてください

  • literally: please transfer me to the next flight
  • more direct as a spoken request

The second version uses the verb 振り替える directly, while the original uses the noun 振替 plus お願いする.

Both are valid, but the feel is different:

• noun + お願いする = formal, service-desk style
• verb + てください = more direct request

The subject is omitted, which is very normal in Japanese.

From context, it usually means something like:

• I request a transfer to the next flight
• Please arrange a transfer to the next flight for me

Japanese often leaves out:

• the subject (I, we)
• the indirect object (for me)
• even the listener, if obvious

So the sentence focuses on the action itself: requesting the transfer.

No. 便 is not limited to airplanes.

It can be used for various scheduled services, especially when talking about numbered or regular departures. Depending on context, it may refer to:

• flights
• buses
• ships/ferries
• delivery service
• postal service

So 次便 means the next scheduled service. In many real situations, especially at airports, it will naturally be understood as the next flight.

It is read ふりかえ in this sentence:

• 振替 = ふりかえ

The related verb is:

• 振り替える（ふりかえる） = to transfer / to switch / to rebook

What happened is that the verb has been turned into a noun-like form:

• 振り替える → 振替

This kind of shortening is common in formal written Japanese, especially in business, transport, and administrative language.

So:

• 振り替える = verb
• 振替 = noun form used in compounds and formal expressions

That is why the wording sounds compact and official.